EP3399112B1 - Hydrant with back flow preventer in the upper part - Google Patents

Hydrant with back flow preventer in the upper part Download PDF

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Publication number
EP3399112B1
EP3399112B1 EP18405011.0A EP18405011A EP3399112B1 EP 3399112 B1 EP3399112 B1 EP 3399112B1 EP 18405011 A EP18405011 A EP 18405011A EP 3399112 B1 EP3399112 B1 EP 3399112B1
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EP
European Patent Office
Prior art keywords
valve
hydrant
spring
seal
water
Prior art date
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Application number
EP18405011.0A
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German (de)
French (fr)
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EP3399112A1 (en
Inventor
Dieter Jermann
Ralph Meier
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Hinni AG
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Hinni AG
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    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03BINSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
    • E03B9/00Methods or installations for drawing-off water
    • E03B9/02Hydrants; Arrangements of valves therein; Keys for hydrants
    • E03B9/16Devices for retaining foreign matter, e.g. sand
    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03BINSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
    • E03B9/00Methods or installations for drawing-off water
    • E03B9/02Hydrants; Arrangements of valves therein; Keys for hydrants
    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03BINSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
    • E03B9/00Methods or installations for drawing-off water
    • E03B9/02Hydrants; Arrangements of valves therein; Keys for hydrants
    • E03B9/04Column hydrants
    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03BINSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
    • E03B9/00Methods or installations for drawing-off water
    • E03B9/02Hydrants; Arrangements of valves therein; Keys for hydrants
    • E03B9/08Underground hydrants
    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03BINSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
    • E03B9/00Methods or installations for drawing-off water
    • E03B9/02Hydrants; Arrangements of valves therein; Keys for hydrants
    • E03B9/14Draining devices for hydrants
    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03CDOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; SINKS
    • E03C1/00Domestic plumbing installations for fresh water or waste water; Sinks
    • E03C1/02Plumbing installations for fresh water
    • E03C1/10Devices for preventing contamination of drinking-water pipes, e.g. means for aerating self-closing flushing valves
    • E03C1/104Devices for preventing contamination of drinking-water pipes, e.g. means for aerating self-closing flushing valves using a single check valve

Definitions

  • the invention relates to a hydrant in the configuration as an underground or above-ground hydrant with a backflow preventer in the upper part, in order to rule out with certainty that inadvertent or malicious media, such as waste water or substances hazardous to health, can be introduced into the water supply network via the hydrant.
  • the upper part is formed by an underfloor attachment, which is hidden underground together with the riser pipe.
  • the upper part is an extension pipe that rises above ground.
  • Hydrants in the form of underground or above-ground hydrants with a direct connection to the underground water supply network are generally used for drawing water, especially for fire fighting work by the fire brigade.
  • water flowing back from connected hoses or fittings - or via a connected pump - can inadvertently or by ill-intentioned people bring dirty water or other media into the water supply network via hydrants. It is therefore relevant to equip hydrants with backflow preventer.
  • the valve with backflow preventer has a closing body that is pressed onto the valve seat via a rod in the closed position, so that neither water from the network flows out of the valve nor inadvertently foreign liquid - e.g. dirty water - could be fed into the network via the valve.
  • water normally flows from the network past the valve and out of its outflow nozzle.
  • blades on the valve swiveled in by the flow reveal an annular gap to the line cross-section. If foreign liquid is introduced into the valve at increased pressure via the discharge nozzle, the closure body moves against the normal direction of flow, closes the valve seat and the counterpressure presses the valve wings against the inner pipe wall.
  • a drainage opening is exposed on the closure body, which is connected to a channel leading to the outside. The dirty water brought into the valve cannot get into the network, but is returned to the outside via the valve through a dirt outlet.
  • the EP 1 347 104 A2 relates to a water outlet valve for installation in a house wall with a mains connection, an outlet and an actuating element.
  • the actuating element is connected to an axially displaceable base body, on which a spring attaches, which on the other hand carries a closure body which shuts off the valve seat.
  • the spring is compressed and the base body presses the closure body onto the valve seat.
  • the base body is set back and the closing body is pressed onto the valve seat by the expanding spring.
  • the closure body is lifted from the valve seat.
  • the valve has an emptying mechanism that is automatically activated when the valve is closed.
  • the FR 2 773 373 A1 deals with an underground hydrant with a backflow preventer.
  • an upper valve seat opens and a spring-loaded closure body arranged below it lifts upwards from the main valve seat, whereby the main valve is in the open position.
  • a second spring holds an additional valve hanging from a plunger on a second valve seat, then the flow of foreign medium introduced into the hydrant into the water supply network is blocked.
  • the additional valve is lifted from the second valve seat by the flow pressure against the force of the second spring and the water flow through enables.
  • the upper valve seat remains closed and the closure body is pressed against the force of the first spring onto the main valve seat.
  • the second spring pulls the additional valve onto the second valve seat, so that an additional shut-off is created in addition to the closed main valve and no foreign medium can enter the water supply network via the hydrant.
  • an assembly for preventing the introduction of foreign matter into the water supply network for post hydrants.
  • the assembly has a spring-loaded additional valve located above the main valve in the riser pipe, which is lifted from the seal seat by the flow pressure when water is withdrawn.
  • the additional valve is normally closed so that when foreign substances are introduced via the hose connection, the foreign substances cannot reach the main valve and on to the water supply network.
  • the spring acting on the additional valve is supported on the valve rod and is guided on it. Foreign substances brought into the hydrant are collected in an abdominal cavity and can be drained from there via an outlet valve or rinsed out with water flowing in via the main valve.
  • EP 2 679 869 A1 describes a main valve with an integrated backflow preventer for a hydrant. If the main valve is in an open position and an attempt is made to introduce the medium via the hydrant into the water supply network, a spring and the medium pressure press a seal onto the main valve seat, which blocks access to the water supply network. The seal sits on the closure body connected to the spring, which is pushed away from the base body firmly connected to the valve rod by the spring acting solely on the closure body.
  • Subject of DE 199 39 113 A1 is the construction of the secondary shut-off valve in each of the two outlet nozzles of a 3-spindle post hydrant.
  • the EP 1 010 821 A1 relates to an underground hydrant which is provided in the outlet connection with a non-return valve designed as a retrofittable insert.
  • the parked hydrant can empty itself automatically via a residual water drain.
  • the US 2009/0 320 933 A1 discloses a post hydrant with a backflow preventer and a ventilation valve for automatic emptying of the hydrant through a drain valve when the main valve is closed.
  • the backflow preventer is installed in the outlet connection of the upper part of the hydrant, while the ventilation valve is installed in the riser pipe.
  • the DE 20 2012 001 007 U1 relates to a hydrant with a backflow preventer, which is part of the shut-off valve, and ventilation valves for draining residual water in the hydrant are installed in the housing of the shut-off valve.
  • the invention is based on the object of creating a hydrant with a backflow preventer to prevent accidental or malicious introduction of media, such as wastewater or health-endangering substances, via hydrants in the water supply network is definitely excluded.
  • the traditional functions of the hydrant must not be impaired.
  • the aim is to increase the functional reliability, to keep the outlay on equipment low and to enable hydrants that have already been installed to be efficiently retrofitted in the water supply network.
  • a further task is to design the non-return valve to be created in a modified form for different variants of upper parts, i.e. for an attachment for an underground hydrant as well as for differently configured attachment pipes for above-ground hydrants.
  • the hydrant in the configuration as an underground or above-ground hydrant for installation in a water supply network has an upper part which, in the case of an above-ground hydrant, is designed as an extension pipe, which is installed soaring above ground.
  • the upper part is designed as an underfloor attachment, which is to be installed hidden underground together with a riser pipe.
  • the upper part has at least one outlet connection used for drawing water.
  • a riser pipe with a valve rod extending vertically therein is connected to the bottom of the upper part.
  • the valve rod is connected on the one hand to the valve rod extension and together forms a valve rod arrangement.
  • the valve rod is connected to a main valve which leads to the water supply network and can be adjusted between a closed position and an open position required for water withdrawal.
  • At least one backflow preventer in the form of a mechanical arrangement with a seal supported by a spring, which is intended to close a sealing surface located in the flow path to the water supply network.
  • a drain valve is provided in the riser pipe for automatic emptying of the water that has accumulated when the hydrant is switched off.
  • the pillar hydrant can be designed as a single-spindle hydrant with the at least one outlet connection and the valve rod arrangement for actuating the main valve.
  • the pillar hydrant is designed as a three-spindle hydrant with two outlet nozzles and two side valves for each separate opening or blocking of the two existing outlet nozzles and the valve rod arrangement for actuating the main valve.
  • the backflow preventer is arranged in the respective outlet connection of the upper part or in the respective side valve of the upper part.
  • the flow path for the ambient air flowing into the hydrant via the ventilation valve bypasses the at least one non-return valve arranged in the upper part and the at least one existing outlet connection.
  • the ventilation valve has a closure body designed as a float, which is built into the upper end of a spindle attachment mounted on the valve rod extension and which closes or releases a ventilation opening into the atmosphere.
  • the backflow preventer intended for installation in an outlet connection has a housing, the outer wall of which is sealed off from the inner wall of the outlet connection.
  • the backflow preventer also has a guide part which is fixedly arranged in the housing, adjacent to the outlet from the outlet connection, and in which one end of the spring is inserted, while the other end of the spring acts on the carrier.
  • the sealing surface on the housing faces away from the outlet and is closed by the seal in the position that acts as a backflow preventer.
  • the backflow preventer which is intended for installation in the two side valves that cannot be operated separately, has a housing installed horizontally in the upper part with a centrally positioned spindle leadthrough and a vertical passage on each side of the spindle leadthrough.
  • the spindle lead-through is used for vertical passage of the valve rod extension.
  • the vertical passages are provided for receiving a fixed guide part with a spring attached and a carrier connected to it.
  • the guide part is telescopically displaceable in the carrier, and the spring is clamped between a cover fastened on top of the vertical passage in question and the carrier below, which is axially displaceably guided in the vertical passage. Below points the carrier on a seal.
  • Inside the upper part there is a sealing surface for each of the side valves, which is closed by the respective seal in the position that acts as a backflow preventer.
  • the backflow preventer intended for installation in the two separately operable side valves also has a housing installed horizontally in the upper part with a centrally positioned spindle lead-through and a vertical passage on each side of the spindle lead-through.
  • the spindle leadthrough in turn serves for the vertical passage of the valve rod extension.
  • the vertical passages are now provided for receiving a rotatable but axially fixed side valve spindle with an axially adjustable but radially locked counter nut screwed onto it, as well as a spring attached below this and a carrier connected to it.
  • the external thread part of the side valve spindle protrudes into the vertical passage and is telescopically slidable in the carrier.
  • the side valve spindle is axially fixed in a cover fastened on top of the vertical passage.
  • the spring is clamped between the lock nut and a spring retainer that is fixed internally in the carrier.
  • the carrier is guided axially displaceably in the vertical passage, and the carrier has the bottom Seal on.
  • the conventional hydrant - here in the form of an above-ground hydrant without a backflow preventer - has a top pipe rising above ground when installed as an upper part 1 , a riser 6 connected to the upper part 1 and standing in the ground, from which an inlet bend leads to the water supply network 9 .
  • the upper part 1 has an outlet connection 11 with a hose connection serving for water extraction, and at the bottom - at the level of the ground - the upper part 1 is surrounded by a foundation ring 19 .
  • a valve rod extension 2 which is connected to a valve rod 7 arranged vertically in the riser pipe 6, extends vertically through the upper part 1 .
  • valve rod 7 is seated in the riser 6 with one Main valve 8 connected, which is adjustable between a closed position and an open position required for water withdrawal and forms the shut-off device to the water supply network 9 .
  • Main valve 8 connected, which is adjustable between a closed position and an open position required for water withdrawal and forms the shut-off device to the water supply network 9 .
  • the valve rod extension 2 and the valve rod 7 together result in the valve rod assembly 2 , 7.
  • the riser pipe 6 has a drainage valve 60 , which is provided when the hydrant is switched off to automatically empty the water that has accumulated in the hydrant.
  • An underground hydrant not shown in the drawing, has in principle the same components. Only the upper part 1 now has the shape of an underfloor attachment with generally much lower overall height and a differently configured outlet connection 11. This type of upper part 1 is arranged underground in a shaft, while the riser 6 is in turn in the ground. The foundation ring 19 is omitted .
  • the return valve 3 in the outlet spigot 11 and is held by the screwed into the outflow pipe 11 with the interposition of the port seal 12 hose connector 13 in position.
  • the backflow preventer 3 is currently in the closed state (see Fig. Figures 2A and 2F ).
  • This non-return valve 3 first comprises a cartridge-shaped housing 36, whose outer wall is sealed against the inner wall of the outlet spigot 11 and which is towards each open to the discharge from the outlet spigot 11 and the upper part 1, wherein the in the direction of the upper part 1, turned away from the outlet sealing surface 360 is formed by a narrowed clearance.
  • an axially movable carrier 32 is arranged, which has a tubular spring receptacle 321 at the rear facing the hose connection 13 , which is followed by a plate-like sealing base 323 and first of all an externally threaded section 324 .
  • the seal 33 is seated on the externally threaded section 324 and on the seal base 323 and is from the counter disk 34 and the locking nut 35 screwed onto the externally threaded section 324 is held.
  • One end of the helical spring 31 acting as a compression spring is inserted in the spring receptacle 321 , while the other end of the spring rests in a winged guide part 30 which is firmly positioned in the housing 36 and which is arranged adjacent to the outlet from the outlet connection 11 .
  • the spring 31 is thus supported on the one hand in the guide part 30 and on the other hand has a resilient effect on the carrier 32 provided with the seal 33 .
  • the sealing surface 360 is closed by the seal 33 .
  • the components of the backflow preventer 3 are designed and arranged in such a way that the pressure from the irregular medium present at the outlet connection 11 increases the contact pressure generated by the spring 31 on the seal 33 and the sealing surface 360 .
  • the introduction of irregular medium through the outlet connection 11 into the hydrant and ultimately into the water supply network 9 is thus excluded.
  • the drainage valve 60 provided in the riser 6 serves as a temporary opening to the ground. According to the state of the art, ventilation of the hydrant for automatic water drainage has so far been possible through the hose connection 13 in the outlet nozzle 11 .
  • a ventilation valve 5 is now provided in the spindle attachment 20 , which is mounted on the valve rod extension 2 , which has a closure body 50 designed as a float.
  • the main valve 8 When the main valve 8 is closed, the water column standing in the hydrant sinks and thus the closure body 50 lowers from the ventilation opening 200 from the previous limited closed position into the limited open position.
  • complete emptying takes place automatically the drain valve 60 into the ground. The flow path for the ambient air flowing into the hydrant via the ventilation valve 5 for emptying it thus no longer runs through the outlet connection 11.
  • the spindle attachment 20 is located in the upper end of the valve rod extension 2 , which ends in a nest space 17 .
  • a positioning sleeve 23 is placed at the bottom, a spindle seal 22 above and a scraper ring 21 at the top, all of which rest in the nest space 17 .
  • the vertical freedom of movement of the closure body 50 is limited by an attached securing element 24 and complementary contours on the closure body 50 and in the nest space 17 .
  • a protective cap 10 that can be slipped onto the upper part 1 serves as a cover for the spindle attachment 20.
  • This sequence of figures relates to an attachment pipe as upper part 1, second variant, in a single-spindle design with two side valves SV left , SV right and two outlet nozzles 11 for a post hydrant.
  • the outlet nozzles 11 are each provided with a hose connection 13 and an interposed connection seal 12 .
  • the valve rod extension 2 extends with the top mounted Spindle attachment 20 , which is accessible within a lower cap part 14 placed on the upper part 1 when the protective cap 10 covering the lower cap part 14 is opened.
  • the two side valves SV left , SV right are installed in a plate-like housing 46 which rests horizontally on the upper part 1 .
  • a sealing surface 16 in the upper part 1 which is designed as a narrowed inside width.
  • the structurally adapted backflow preventer 4 is formed by the respective side valve SV left , SV right .
  • the check valve 4 in the left side valve SV is left (closed open, while the right side valve SV right s. Figure 3A ). This situation does not exist in reality, but is only intended to illustrate the possible positions of the side valves SV left , SV right .
  • Either both side valves SV left , SV right would be in the open position, namely by the water pressure when the main valve 8 is open. Or when the main valve 8 is closed, the action of the two springs 41 also closes both side valves SV left , SV right .
  • the "one-sided closed" situation can arise, however, when the flow path via one of the two side valves SV left , SV right is blocked by the fact that the hose or other consumer connected to the relevant side valve SV left , SV right is closed at the end, typically e.g. at a fire brigade nozzle.
  • the ventilation of the hydrant by means of the ventilation valve 5 for automatic water drainage when the main valve 8 is closed and the closure of the ventilation opening 200 when the main valve 8 is open are for the execution according to FIGS Figures 2A to 2E identical.
  • the housing 46 has a centrally positioned spindle leadthrough 460 for the vertical passage of the valve rod extension 2 and on both sides of the spindle leadthrough 460 each have a vertical passage 466 for receiving a fixed, rod-shaped guide part 40 with an attached spring 41 and thus connected cartridge-like carrier 42.
  • the wiper ring 21 and the spindle seal 22 which are penetrated by the spindle attachment 20, are inserted into the socket seat 461 and the seal seat 462 of the spindle leadthrough 460 .
  • the guide part 40 is telescopically slidable in the support 42 , namely in its axial spring receptacle 421 , which forms a cylindrical free space .
  • the spring 41 is between a cover 427 fastened on top of the relevant vertical passage 466 with the screws 428 - below this the wiper ring 426 is inserted - and clamped below the carrier 42 , which is axially displaceably guided in the vertical passage 466 .
  • the spring 41 is in turn a helical spring acting as a compression spring.
  • a counter-disk 44 is fastened to the bottom of the carrier 42 by means of a connecting element 424 , for example a screw.
  • the disk-shaped sealing base 423 with the screws 429 and the nuts 45 is attached to the counter disk 44 from below.
  • the seal 43 is seated at the bottom of the combination of counter-disk 44 and seal base 423 .
  • the sealing surface 16 present inside the upper part 1 for each of the side valves SV left , SV right is closed by the respective seal 43 in the position that acts as a backflow preventer 4 .
  • the components of the backflow preventer 4 in the respective side valve SV left , SV right are again designed and arranged in such a way that in the position effective as backflow preventer 4 - i.e. with the main valve 8 closed - the pressure of an irregular medium at the outlet connection 11 is that of the spring 41 increased contact pressure generated on the seal 43 and the sealing surface 16 .
  • This sequence of figures relates to an attachment pipe as an upper part 1, third variant, in a three-spindle design with two side valves SV left , SV right and two outlet nozzles 11 for a post hydrant.
  • the outlet nozzles 11 are in turn each provided with a hose connection 13 and an interposed connection seal 12 .
  • the side valves SV left , SV right can be operated separately by actuating the respective side valve spindle 25 .
  • the valve rod extension 2 extends vertically with the spindle attachment 20 located above, which is hidden in the lower cap part 14 placed on the upper part 1 , but becomes accessible when the protective cap 10 covering the lower cap part 14 is opened.
  • a cover 427 with an interposed wiper ring 426 is attached to the top of the housing 46 with the screws 428 over each of the two vertical passages 466 .
  • a rotatable but axially fixed side valve spindle 25 is seated on the cover 427 with the interposition of a further seal 425 , the axially adjustable but radially locked counter nut 26 , which is guided in the vertical passage 466 , is screwed onto the threaded shaft 250 .
  • the threaded shaft 250 protruding through the vertical passage 466 extends into the carrier 42 , which is arranged displaceably to a limited extent in the vertical passage 466 .
  • the compressible spring 41 is on the threaded shaft 250 and is clamped between the counter nut 26 and a fixed point in the spring receptacle 421 of the carrier 42 .
  • the assembly consisting of the counter disk 44 , seal base 423 , connecting element 424 , screws 429 , seal 43 and nuts 45 is as in the previous variant Figures 3B to 3D procure and attached to the carrier 42 .
  • the nature and positioning of the sealing surfaces 16 are also identical .
  • the separate Absperr south both side valves SV left SV right this pair of figures
  • the check valve 4 in the left side valve SV reflects a real possible different position of both side valves SV left SV right or backflow preventer fourth left is closed open, while the right side valve SV right.
  • This situation arises when the main valve 8 and also the left side valve SV are left open, so water can be taken from the left outlet spigot.
  • the unlocked left side valve SV left is pressed into the open position according to the upper position of the lock nut 26 against the action of the upwardly compressed spring 41 .
  • the carrier 42 slides upward into the relevant vertical passage 466 .
  • the right side valve SV on the right is locked in the closed position according to the lower position of the lock nut 26 , so that the water pressure cannot cause an opening.
  • the spring 41 is compressed maximally downwards by the lock nut 26 and the carrier 42 is pushed out downwards into the relevant vertical passage 466 .
  • the ventilation valve 5 is closed as a result of the water standing in the valve rod extension 2 , and the closure body 50 is lifted into its closed position.
  • the hydrant is currently not under pressure because the main valve 8 is either closed or the hydrant is not at all on the water pipe network 9 or the water pipe network 9 is currently depressurized.
  • the non-return valve 4 is unarretiert left according to the upper position of the lock nut 26 in the left side of valve SV, however, pushed by the action of the spring 41 in the closed position.
  • the spring 41 has expanded upwards and downwards.
  • the carrier 42 has moved maximally downward out of the relevant vertical passage 466 .
  • the situation shown arises when this side valve SV is in the open position on the left , but no water pressure is acting.
  • the ventilation valve 5 would be open because the lack of buoyancy causes the closure body 50 to sink into its open position.
  • the hydrant is not under pressure - for example, because the main valve 8 is closed - yet the locknut so the associated sealing surface 16, 26 of the return valve 4 is locked to the right in the closed position in the right side of valve SV due to the lower position, closed by the-engaging seal 43rd
  • the spring 41 is pressed downwards by the lock nut 26 , has moved downwards to the maximum and thereby driven the carrier 42 downwards to the maximum extent from the relevant vertical passage 466 . Due to the lack of buoyancy, the closure body 50 sinks, the ventilation valve 5 assumes an open position.
  • the situation in the left side valve SV on the left is identical to the positions in the left side valve SV on the left according to Figure 4F as it would be immediately before the hydrant was used or immediately after it was taken out of service.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Check Valves (AREA)

Description

Anwendungsgebiet der ErfindungField of application of the invention

Die Erfindung betrifft einen Hydranten in der Konfiguration als Unter- oder Überflurhydrant mit im Oberteil vorhandenem Rückflussverhinderer, um mit Sicherheit auszuschliessen, dass versehentlich oder bösartig Medien, wie Schmutzwasser oder die Gesundheit gefährdende Stoffe, über den Hydranten in das Wasserleitungsnetz eingebracht werden können. Bei einem Unterflurhydranten wird das Oberteil von einem Unterfluraufsatz gebildet, das zusammen mit dem Steigrohr unterirdisch verborgen ist. Beim Überflurhydranten hingegen ist das Oberteil ein Aufsatzrohr, welches oberirdisch aufragt.The invention relates to a hydrant in the configuration as an underground or above-ground hydrant with a backflow preventer in the upper part, in order to rule out with certainty that inadvertent or malicious media, such as waste water or substances hazardous to health, can be introduced into the water supply network via the hydrant. In the case of an underground hydrant, the upper part is formed by an underfloor attachment, which is hidden underground together with the riser pipe. In the case of the post hydrant, on the other hand, the upper part is an extension pipe that rises above ground.

Stand der TechnikState of the art

Hydranten in Gestalt von Unterflur- oder Überflurhydranten mit direktem Anschluss an das unterirdische Wasserleitungsnetz, dienen grundsätzlich zur Wasserentnahme, insbesondere für Löscharbeiten der Feuerwehr. Jedoch können aus angeschlossenen Schläuchen oder Armaturen zurückfliessendes Wasser - oder über eine angeschlossene Pumpe - versehentlich oder von übel gesinnten Personen Schmutzwasser oder andere Medien über Hydranten in das Wasserleitungsnetz eingebracht werden. Daher ist die Ausstattung von Hydranten mit Rückflussverhinderern relevant.Hydrants in the form of underground or above-ground hydrants with a direct connection to the underground water supply network are generally used for drawing water, especially for fire fighting work by the fire brigade. However, water flowing back from connected hoses or fittings - or via a connected pump - can inadvertently or by ill-intentioned people bring dirty water or other media into the water supply network via hydrants. It is therefore relevant to equip hydrants with backflow preventer.

Gemäss der US 5,752,542 besitzt das Ventil mit Rückflussverhinderer einen in der Verschlussstellung auf den Ventilsitz über ein Gestänge aufgedrückten Verschlusskörper, so dass weder Wasser aus dem Netz aus dem Ventil herausfliesst noch versehentlich fremde Flüssigkeit - z.B. Schmutzwasser - über das Ventil in das Netz eingespeist werden könnte. In der Offenstellung strömt normalerweise Wasser aus dem Netz am Ventil vorbei aus dessen Ausflussstutzen heraus. Hierbei geben von der Strömung eingeschwenkte Flügel am Ventil einen Ringspalt zum Leitungsquerschnitt frei. Sollte über den Ausflussstutzen fremde Flüssigkeit mit erhöhtem Druck in das Ventil eingebracht werden, verschiebt sich der Verschlusskörper entgegen der normalen Strömungsrichtung, verschliesst den Ventilsitz, und die Ventilflügel werden vom Gegendruck gegen die innere Leitungswandung gedrückt. Durch die Verschiebung kommt am Verschlusskörper eine Abflussöffnung frei, die mit einem nach aussen führenden Kanal verbunden ist. So kann das in das Ventil eingebrachte Schmutzwasser nicht in das Netz gelangen, sondern wird rückgeleitet über das Ventil durch einen Schmutzauslass nach aussen verbracht.According to the U.S. 5,752,542 the valve with backflow preventer has a closing body that is pressed onto the valve seat via a rod in the closed position, so that neither water from the network flows out of the valve nor inadvertently foreign liquid - e.g. dirty water - could be fed into the network via the valve. In the open position, water normally flows from the network past the valve and out of its outflow nozzle. Here, blades on the valve swiveled in by the flow reveal an annular gap to the line cross-section. If foreign liquid is introduced into the valve at increased pressure via the discharge nozzle, the closure body moves against the normal direction of flow, closes the valve seat and the counterpressure presses the valve wings against the inner pipe wall. As a result of the displacement, a drainage opening is exposed on the closure body, which is connected to a channel leading to the outside. The dirty water brought into the valve cannot get into the network, but is returned to the outside via the valve through a dirt outlet.

Die EP 1 347 104 A2 betrifft ein Wasserauslassventil zum Einbau in einer Hauswand mit einem Netzanschluss, einem Auslass und einem Betätigungselement. Das Betätigungselement hat mit einem axial verschiebbaren Basiskörper Verbindung, an dem eine Feder ansetzt, die andererseits einen Verschlusskörper trägt, welcher den Ventilsitz absperrt. Bei geschlossenem Ventil ist die Feder zusammengedrückt und der Basiskörper presst den Verschlusskörper auf den Ventilsitz. Bei geöffnetem Ventil ist der Basiskörper zurückgesetzt und durch die sich ausdehnende Feder wird der Verschlusskörper auf den Ventilsitz gedrückt. Bei Wasserentnahme und damit entstehendem Strömungsdruck jedoch hebt sich der Verschlusskörper vom Ventilsitz. Gelangen bei geöffnetem Ventil rückfliessendes Wasser oder Schadstoffe in das Ventil, ergibt sich durch den auf dem Ventilsitz ruhenden Verschlusskörper eine Absperrung, und das Einströmen der Schadstoffe in das Wasserleitungsnetz wird damit verhindert. Das Ventil besitzt einen Entleerungsmechanismus, der bei geschlossenem Ventil automatisch aktiviert wird.The EP 1 347 104 A2 relates to a water outlet valve for installation in a house wall with a mains connection, an outlet and an actuating element. The actuating element is connected to an axially displaceable base body, on which a spring attaches, which on the other hand carries a closure body which shuts off the valve seat. When the valve is closed, the spring is compressed and the base body presses the closure body onto the valve seat. When the valve is open, the base body is set back and the closing body is pressed onto the valve seat by the expanding spring. However, when water is withdrawn and the resulting flow pressure, the closure body is lifted from the valve seat. If back-flowing water or pollutants get into the valve when the valve is open, the closure body resting on the valve seat results in a shut-off, and the pollutants from flowing into the water supply network are thus prevented. The valve has an emptying mechanism that is automatically activated when the valve is closed.

Die FR 2 773 373 A1 hat einen Unterflurhydranten mit Rückflussverhinderer zum Gegenstand. Mit dem Aufdrehen der Ventilstange öffnet sich ein oberer Ventilsitz, und ein darunter angeordneter federgelagerter Verschlusskörper hebt vom Hauptventilsitz aufwärts ab, wodurch das Hauptventil in Offenstellung gelangt. Erfolgt keine Wasserentnahme hält eine zweite Feder ein an einem Stössel hängendes Zusatzventil auf einem zweiten Ventilsitz, so ist das Einströmen von in den Hydranten eingebrachtem fremdem Medium in das Wasserleitungsnetz blockiert. Bei Wasserentnahme wird vom Strömungsdruck gegen die Kraft der zweiten Feder das Zusatzventil vom zweiten Ventilsitz abgehoben und der Wasserdurchfluss ermöglicht. Ist das Hauptventil geschlossen, bleibt der obere Ventilsitz zu und der Verschlusskörper wird gegen die Kraft der ersten Feder auf den Hauptventilsitz gedrückt. Gleichzeitig zieht die zweite Feder das Zusatzventil auf den zweiten Ventilsitz, so dass damit zum geschlossenen Hauptventil eine zusätzliche Absperrung entsteht und kein Fremdmedium über den Hydranten in das Wasserleitungsnetz gelangen kann.The FR 2 773 373 A1 deals with an underground hydrant with a backflow preventer. When the valve rod is unscrewed, an upper valve seat opens and a spring-loaded closure body arranged below it lifts upwards from the main valve seat, whereby the main valve is in the open position. If there is no water withdrawal, a second spring holds an additional valve hanging from a plunger on a second valve seat, then the flow of foreign medium introduced into the hydrant into the water supply network is blocked. When water is withdrawn, the additional valve is lifted from the second valve seat by the flow pressure against the force of the second spring and the water flow through enables. If the main valve is closed, the upper valve seat remains closed and the closure body is pressed against the force of the first spring onto the main valve seat. At the same time, the second spring pulls the additional valve onto the second valve seat, so that an additional shut-off is created in addition to the closed main valve and no foreign medium can enter the water supply network via the hydrant.

In der US 2008/0135100 A1 ist für Überflurhydranten eine Baugruppe zur Verhinderung des Einbringens von Fremdstoffen in das Wasserleitungsnetz offenbart. Die Baugruppe hat ein oberhalb des Hauptventils im Steigrohr angeordnetes federgelagertes Zusatzventil, das bei Wasserentnahme durch den Strömungsdruck vom Dichtungssitz abgehoben wird. Normalerweise ist das Zusatzventil geschlossen, so dass beim Einbringen von Fremdstoffen über den Schlauchanschluss die Fremdstoffe nicht in Richtung Hauptventil und weiter zum Wasserleitungsnetz gelangen können. Die auf das Zusatzventil wirkende Feder stützt sich an der Ventilstange ab und ist auf dieser geführt. In den Hydranten eingebrachte Fremdstoffe werden in einem Bauchraum gesammelt und können von dort über ein Auslassventil abgelassen oder mit über das Hauptventil zuströmendem Wasser ausgespült werden.In the US 2008/0135100 A1 an assembly for preventing the introduction of foreign matter into the water supply network is disclosed for post hydrants. The assembly has a spring-loaded additional valve located above the main valve in the riser pipe, which is lifted from the seal seat by the flow pressure when water is withdrawn. The additional valve is normally closed so that when foreign substances are introduced via the hose connection, the foreign substances cannot reach the main valve and on to the water supply network. The spring acting on the additional valve is supported on the valve rod and is guided on it. Foreign substances brought into the hydrant are collected in an abdominal cavity and can be drained from there via an outlet valve or rinsed out with water flowing in via the main valve.

In der EP 2 679 869 A1 ist ein Hauptventil mit integriertem Rückflussverhinderer für einen Hydranten beschrieben. Bei an sich vorhandener Offenstellung des Hauptventils und versuchter Einleitung von Medium über den Hydranten in das Wasserleitungsnetz wird von einer Feder und dem Mediumdruck eine Dichtung auf den Hauptventilsitz gepresst, welche den Zugang zum Wasserleitungsnetz sperrt. Die Dichtung sitzt auf dem mit der Feder verbundenen Verschlusskörper, der von dem mit der Ventilstange fest verbundenen Basiskörper durch die allein auf den Verschlusskörper wirkende Feder weggedrückt wird.In the EP 2 679 869 A1 describes a main valve with an integrated backflow preventer for a hydrant. If the main valve is in an open position and an attempt is made to introduce the medium via the hydrant into the water supply network, a spring and the medium pressure press a seal onto the main valve seat, which blocks access to the water supply network. The seal sits on the closure body connected to the spring, which is pushed away from the base body firmly connected to the valve rod by the spring acting solely on the closure body.

Gegenstand der DE 199 39 113 A1 ist die Konstruktion des jeweils in den beiden Abgangsstutzen eines 3-Spindel-Überflurhydranten angeordneten Nebenabsperrventils.Subject of DE 199 39 113 A1 is the construction of the secondary shut-off valve in each of the two outlet nozzles of a 3-spindle post hydrant.

In der US 2004/0 154 659 A1 wird ein Hydrant mit im Abgangsstutzen eingebautem Rückflussverhinderer beschrieben. Die EP 1 010 821 A1 betrifft einen Unterflurhydranten, der im Abgangsstutzen mit einem als nachrüstbarer Einsatz ausgebildetem Rückflussverhinderer versehen ist. Der abgestellte Hydrant kann sich über einen Restwasserabfluss selbsttätig entleeren.In the US 2004/0 154 659 A1 describes a hydrant with a non-return valve built into the outlet nozzle. The EP 1 010 821 A1 relates to an underground hydrant which is provided in the outlet connection with a non-return valve designed as a retrofittable insert. The parked hydrant can empty itself automatically via a residual water drain.

Aus der US 7,428,910 B2 ist bekannt, das Ventilgestänge an Hydranten mit Durchgangsöffnungen zu versehen, um bei geschlossenem Hauptventil die Entleerung des im Hydranten stehenden Restwassers durch eine Entwässerungsöffnung zu begünstigen.From the US 7,428,910 B2 It is known to provide the valve linkage on hydrants with through openings in order to facilitate the emptying of the remaining water in the hydrant through a drainage opening when the main valve is closed.

Die US 2009/0 320 933 A1 offenbart einen Überflurhydranten mit einem Rückflussverhinderer und einem Belüftungsventil zur automatischen Entleerung des Hydranten bei geschlossenem Hauptventil durch ein Entwässerungsventil. Der Rückflussverhinderer ist im Abgangsstutzen des Hydrantenoberteils installiert, während das Belüftungsventil im Steigrohr eingebaut ist. Auch die DE 20 2012 001 007 U1 betrifft einen Hydranten mit Rückflussverhinderer, der jedoch Bestandteil des Absperrventils ist, und Belüftungsventile zur Entleerung von im Hydranten stehenden Restwassers sind im Gehäuse des Absperrventils eingesetzt.The US 2009/0 320 933 A1 discloses a post hydrant with a backflow preventer and a ventilation valve for automatic emptying of the hydrant through a drain valve when the main valve is closed. The backflow preventer is installed in the outlet connection of the upper part of the hydrant, while the ventilation valve is installed in the riser pipe. Also the DE 20 2012 001 007 U1 relates to a hydrant with a backflow preventer, which is part of the shut-off valve, and ventilation valves for draining residual water in the hydrant are installed in the housing of the shut-off valve.

Aufgabe der ErfindungObject of the invention

Der Erfindung liegt die Aufgabe zugrunde, einen Hydranten mit Rückflussverhinderer zu schaffen, damit versehentliches oder bösartiges Einbringen von Medien, wie Schmutzwasser oder die Gesundheit gefährdenden Stoffen, über Hydranten in das Wasserleitungsnetz mit Sicherheit ausgeschlossen ist. Hierbei dürfen die angestammten Funktionen des Hydranten nicht beeinträchtigt werden. In Relation zum oben referenzierten vorbekannten Stand der Technik gilt es, die Funktionssicherheit zu erhöhen, den apparativen Aufwand gering zu halten und eine effiziente Nachrüstbarkeit im Wasserleitungsnetz bereits installierter Hydranten zu ermöglichen.The invention is based on the object of creating a hydrant with a backflow preventer to prevent accidental or malicious introduction of media, such as wastewater or health-endangering substances, via hydrants in the water supply network is definitely excluded. The traditional functions of the hydrant must not be impaired. In relation to the above-referenced prior art, the aim is to increase the functional reliability, to keep the outlay on equipment low and to enable hydrants that have already been installed to be efficiently retrofitted in the water supply network.

Eine weitere Aufgabe besteht darin, den zu schaffenden Rückflussverhinderer für verschiedene Varianten von Oberteilen modifiziert auszugestalten, d.h. für einen Aufsatz für einen Unterflurhydranten sowie für verschieden konfigurierte Aufsatzrohre für Überflurhydranten.A further task is to design the non-return valve to be created in a modified form for different variants of upper parts, i.e. for an attachment for an underground hydrant as well as for differently configured attachment pipes for above-ground hydrants.

Übersicht über die ErfindungOverview of the invention

Der Hydrant in der Konfiguration als Unter- oder Überflurhydrant zur Installation in einem Wasserleitungsnetz hat ein Oberteil, das bei einem Überflurhydranten als Aufsatzrohr ausgebildet ist, welches oberirdisch aufragend eingebaut wird. Alternativ ist bei einem Unterflurhydranten das Oberteil als Unterfluraufsatz ausgebildet, welches zusammen mit einem Steigrohr unterirdisch verborgen einzubauen ist. Das Oberteil weist zumindest einen zur Wasserentnahme dienenden Abgangsstutzen auf. Im Oberteil gibt es eine vertikal angeordnete Ventilstangenverlängerung. Unten an das Oberteil ist ein Steigrohr mit einer darin sich vertikal erstreckenden Ventilstange angeschlossen. Die Ventilstange ist einerseits mit der Ventilstangenverlängerung verbunden und bildet gemeinsam eine Ventilstangenanordnung. Andererseits ist die Ventilstange mit einem Hauptventil verbunden, das zum Wasserleitungsnetz führt und zwischen einer Schliessstellung und einer zur Wasserentnahme bedingten Offenstellung einstellbar ist.The hydrant in the configuration as an underground or above-ground hydrant for installation in a water supply network has an upper part which, in the case of an above-ground hydrant, is designed as an extension pipe, which is installed soaring above ground. Alternatively, in the case of an underground hydrant, the upper part is designed as an underfloor attachment, which is to be installed hidden underground together with a riser pipe. The upper part has at least one outlet connection used for drawing water. There is a vertically arranged valve rod extension in the upper part. A riser pipe with a valve rod extending vertically therein is connected to the bottom of the upper part. The valve rod is connected on the one hand to the valve rod extension and together forms a valve rod arrangement. On the other hand, the valve rod is connected to a main valve which leads to the water supply network and can be adjusted between a closed position and an open position required for water withdrawal.

Im Oberteil ist zumindest ein Rückflussverhinderer in Gestalt einer mechanischen Anordnung mit einer von einer Feder gestützten Dichtung vorhanden, die zum Verschluss einer im Strömungsweg zum Wasserleitungsnetz liegenden Dichtfläche bestimmt ist. Im Steigrohr ist ein Entwässerungsventil zur selbsttätigen Entleerung des bei abgestelltem Hydranten darin gestauten Wassers vorgesehen.In the upper part there is at least one backflow preventer in the form of a mechanical arrangement with a seal supported by a spring, which is intended to close a sealing surface located in the flow path to the water supply network. A drain valve is provided in the riser pipe for automatic emptying of the water that has accumulated when the hydrant is switched off.

Der Überflurhydrant kann als Ein-Spindel-Hydrant mit dem zumindest einen Abgangsstutzen und der Ventilstangenanordnung zur Betätigung des Hauptventils beschaffen sein. Alternativ ist der Überflurhydrant als Drei-Spindel-Hydrant mit zwei Abgangsstutzen und zwei Seitenventilen zur jeweils separaten Öffnung bzw. Absperrung der zwei vorhandenen Abgangsstutzen und der Ventilstangenanordnung zur Betätigung des Hauptventils ausgebildet. Der Rückflussverhinderer ist im jeweiligen Abgangsstutzen des Oberteils oder im jeweiligen Seitenventil des Oberteils angeordnet.The pillar hydrant can be designed as a single-spindle hydrant with the at least one outlet connection and the valve rod arrangement for actuating the main valve. Alternatively, the pillar hydrant is designed as a three-spindle hydrant with two outlet nozzles and two side valves for each separate opening or blocking of the two existing outlet nozzles and the valve rod arrangement for actuating the main valve. The backflow preventer is arranged in the respective outlet connection of the upper part or in the respective side valve of the upper part.

Ein Belüftungsventil ist vorgesehen, welches:

  • bei abgestelltem Hydranten mit geschlossenem Hauptventil das Einströmen von Umgebungsluft in den Hydranten erlaubt, um die selbsttätige Entleerung des im Hydranten gestauten Wassers durch die Entwässerungsöffnung zu ermöglichen; und
  • bei geöffnetem Hauptventil den Fluss von Wasser durch das Belüftungsventil in die Umgebung blockiert.
A ventilation valve is provided which:
  • when the hydrant is switched off and the main valve is closed, the flow of ambient air into the hydrant is allowed in order to enable the water accumulated in the hydrant to be automatically drained through the drainage opening; and
  • blocks the flow of water through the vent valve into the environment when the main valve is open.

Der Strömungsweg für die über das Belüftungsventil in den Hydranten einströmende Umgebungsluft umgeht den zumindest einen im Oberteil angeordneten Rückflussverhinderer und den zumindest einen vorhandenen Abgangsstutzen. Das Belüftungsventil besitzt einen als Schwimmer ausgebildeten Verschlusskörper, der in das obere Ende eines auf die Ventilstangenverlängerung montierten Spindelaufsatzes eingebaut ist und eine Belüftungsöffnung in die Atmosphäre verschliesst bzw. freigibt.The flow path for the ambient air flowing into the hydrant via the ventilation valve bypasses the at least one non-return valve arranged in the upper part and the at least one existing outlet connection. The ventilation valve has a closure body designed as a float, which is built into the upper end of a spindle attachment mounted on the valve rod extension and which closes or releases a ventilation opening into the atmosphere.

Besonders vorteilhafte Details zur ersten Variante eines OberteilsParticularly advantageous details on the first variant of an upper part

Der zum Einbau in einen Abgangsstutzen bestimmte Rückflussverhinderer hat ein Gehäuse, dessen Aussenwandung gegenüber der Innenwandung des Abgangsstutzens abgedichtet ist. Im Gehäuse ist ein axial beweglicher Träger angeordnet, welcher von der Feder gestützt und mit der Dichtung versehen ist.The backflow preventer intended for installation in an outlet connection has a housing, the outer wall of which is sealed off from the inner wall of the outlet connection. An axially movable carrier, which is supported by the spring and provided with the seal, is arranged in the housing.

Der Rückflussverhinderer besitzt ferner ein Führungsteil, welches fest im Gehäuse, benachbart zum Austritt aus dem Abgangsstutzens angeordnet ist, und in welchem ein Ende der Feder steckt, während das andere Ende der Feder auf den Träger einwirkt. Die am Gehäuse vorhandene Dichtfläche liegt vom Austritt abgewendet und wird von der Dichtung in der als Rückflussverhinderer wirksamen Stellung verschlossen.The backflow preventer also has a guide part which is fixedly arranged in the housing, adjacent to the outlet from the outlet connection, and in which one end of the spring is inserted, while the other end of the spring acts on the carrier. The sealing surface on the housing faces away from the outlet and is closed by the seal in the position that acts as a backflow preventer.

Das Gehäuse ist kartuschenförmig und zum Austritt aus dem Abgangsstutzen und zum Oberteil hin jeweils offen, wobei die in Richtung Oberteil liegende Dichtfläche durch eine verengte lichte Weite gebildet ist. Die Feder ist eine als Druckfeder wirkende Schraubenfeder. Der Träger besitzt eine Federaufnahme, an welcher die Feder ansetzt, und eine scheibenförmige Dichtungsbasis, auf welcher die Dichtung angeordnet ist. Die Bauteile des Rückflussverhinderers sind so gestaltet und angeordnet, dass:

  • in der als Rückflussverhinderer wirksamen Stellung der Druck vom am Abgangsstutzen anstehenden irregulären Medium den von der Feder auf die Dichtung und die Dichtfläche generierten Anpressdruck verstärkt; und
  • bei Wasserentnahme aus dem Abgangsstutzen sich entgegen der Wirkung der Feder die Dichtung durch den Strömungsdruck von der Dichtfläche entfernt und damit freier Weg für den Wasserfluss durch das Gehäuse zum Austritt aus dem Abgangsstutzen besteht.
The housing is cartridge-shaped and is open towards the outlet from the outlet connection and towards the upper part, the sealing surface in the direction of the upper part being formed by a narrowed clear width. The spring is a helical spring that acts as a compression spring. The carrier has a spring receptacle on which the spring is attached and a disk-shaped seal base on which the seal is arranged. The components of the backflow preventer are designed and arranged so that:
  • In the position that acts as a backflow preventer, the pressure from the irregular medium at the outlet connection increases the contact pressure generated by the spring on the seal and the sealing surface; and
  • When water is withdrawn from the outlet connection, the seal is removed from the sealing surface by the flow pressure against the action of the spring, and there is thus a free path for the water to flow through the housing to the outlet from the outlet connection.

Besonders vorteilhafte Details zur zweiten Variante eines OberteilsParticularly advantageous details for the second variant of an upper part

Der zum Einbau in die beiden nicht separat bedienbaren Seitenventile jeweils bestimmte Rückflussverhinderer besitzt ein in das Oberteil horizontal eingebautes Gehäuse mit einer zentral positionierten Spindeldurchführung und beidseits der Spindeldurchführung jeweils eine Vertikalpassage. Die Spindeldurchführung dient zum vertikalen Durchtritt der Ventilstangenverlängerung. Die Vertikalpassagen sind zur jeweiligen Aufnahme eines feststehenden Führungsteils mit aufgesteckter Feder und damit verbundenem Träger vorgesehen. Das Führungsteil steckt teleskopisch verschiebbar im Träger, und die Feder ist zwischen einem oben auf der betreffenden Vertikalpassage befestigtem Deckel und unten dem Träger eingespannt, der axial verschiebbar in der Vertikalpassage geführt ist. Unten weist der Träger eine Dichtung auf. Innerlich des Oberteils ist für jedes der Seitenventile eine Dichtfläche vorhanden, welche von der jeweiligen Dichtung in der als Rückflussverhinderer wirksamen Stellung verschlossen ist.The backflow preventer, which is intended for installation in the two side valves that cannot be operated separately, has a housing installed horizontally in the upper part with a centrally positioned spindle leadthrough and a vertical passage on each side of the spindle leadthrough. The spindle lead-through is used for vertical passage of the valve rod extension. The vertical passages are provided for receiving a fixed guide part with a spring attached and a carrier connected to it. The guide part is telescopically displaceable in the carrier, and the spring is clamped between a cover fastened on top of the vertical passage in question and the carrier below, which is axially displaceably guided in the vertical passage. Below points the carrier on a seal. Inside the upper part there is a sealing surface for each of the side valves, which is closed by the respective seal in the position that acts as a backflow preventer.

Das Gehäuse ist im Wesentlichen plattenförmig. Die jeweilige Dichtfläche wird durch eine verengte lichte Weite im Oberteil gebildet. Die Feder ist eine als Druckfeder wirkende Schraubenfeder, und das Führungsteil hat Stabform. Am freien Ende des Trägers ist eine scheibenförmige Dichtungsbasis befestigt, auf welcher die Dichtung sitzt. Die Bauteile des Rückflussverhinderers im jeweiligen Seitenventil sind wiederum so gestaltet und angeordnet, dass:

  • in der als Rückflussverhinderer wirksamen Stellung der Druck vom am Abgangsstutzen anstehenden irregulären Medium den von der Feder auf die Dichtung und die Dichtfläche generierten Anpressdruck verstärkt; und
  • bei Wasserentnahme aus dem betreffenden Abgangsstutzen sich entgegen der Wirkung der Feder die Dichtung durch den Strömungsdruck von der Dichtfläche abhebt und damit freier Weg für den Wasserfluss durch die geöffnete Dichtfläche zum genutzten Abgangsstutzen entsteht.
The housing is essentially plate-shaped. The respective sealing surface is formed by a narrowed clear width in the upper part. The spring is a coil spring acting as a compression spring, and the guide part has a rod shape. At the free end of the carrier, a disk-shaped seal base is attached, on which the seal sits. The components of the backflow preventer in the respective side valve are designed and arranged in such a way that:
  • In the position that acts as a backflow preventer, the pressure from the irregular medium at the outlet connection increases the contact pressure generated by the spring on the seal and the sealing surface; and
  • When water is withdrawn from the outlet connection in question, the seal is lifted from the sealing surface by the flow pressure against the action of the spring, thus creating a free path for the water to flow through the open sealing surface to the outlet connection used.

Besonders vorteilhafte Details zur dritten Variante eines OberteilsParticularly advantageous details for the third variant of an upper part

Der zum Einbau in die beiden separat bedienbaren Seitenventile jeweils bestimmte Rückflussverhinderer besitzt ebenfalls ein in das Oberteil horizontal eingebautes Gehäuse mit einer zentral positionierten Spindeldurchführung und beidseits der Spindeldurchführung jeweils eine Vertikalpassage. Die Spindeldurchführung dient wiederum zum vertikalen Durchtritt der Ventilstangenverlängerung. Die Vertikalpassagen sind nun zur jeweiligen Aufnahme einer drehbaren aber axial feststehenden Seitenventilspindel mit darauf aufgeschraubter axial verstellbaren aber radial arretierten Gegenmutter, sowie unterhalb dieser aufgesteckter Feder und damit verbundenem Träger vorgesehen. Das Aussengewindeteil der Seitenventilspindel ragt in die Vertikalpassage hinein und steckt teleskopisch verschiebbar im Träger. Die Seitenventilspindel ist in einem oben auf der Vertikalpassage befestigten Deckel axial fixiert. Die Feder ist zwischen der Gegenmutter und einer intern im Träger feststehenden Federaufnahme eingespannt. Erneut wird der Träger axial verschiebbar in der Vertikalpassage geführt, und der Träger weist unten die Dichtung auf. Innerlich des Oberteils ist ebenfalls für jedes der Seitenventile eine Dichtfläche vorhanden, welche von der jeweiligen Dichtung in der als Rückflussverhinderer wirksamen Stellung verschlossen ist.The backflow preventer intended for installation in the two separately operable side valves also has a housing installed horizontally in the upper part with a centrally positioned spindle lead-through and a vertical passage on each side of the spindle lead-through. The spindle leadthrough in turn serves for the vertical passage of the valve rod extension. The vertical passages are now provided for receiving a rotatable but axially fixed side valve spindle with an axially adjustable but radially locked counter nut screwed onto it, as well as a spring attached below this and a carrier connected to it. The external thread part of the side valve spindle protrudes into the vertical passage and is telescopically slidable in the carrier. The side valve spindle is axially fixed in a cover fastened on top of the vertical passage. The spring is clamped between the lock nut and a spring retainer that is fixed internally in the carrier. Again, the carrier is guided axially displaceably in the vertical passage, and the carrier has the bottom Seal on. Inside the upper part there is also a sealing surface for each of the side valves, which is closed by the respective seal in the position that acts as a backflow preventer.

Auch für diese Variante gilt, dass:

  • das Gehäuse im Wesentlichen plattenförmig ist;
  • die jeweilige Dichtfläche durch eine verengte lichte Weite im Oberteil gebildet ist;
  • die Feder eine als Druckfeder wirkende Schraubenfeder ist;
  • am freien Ende des Trägers eine scheibenförmige Dichtungsbasis befestigt ist, auf welcher die Dichtung sitzt; und
  • die Bauteile des Rückflussverhinderers im jeweiligen Seitenventil so gestaltet und angeordnet sind, dass:
    • in der als Rückflussverhinderer wirksamen Stellung der Druck vom am Abgangsstutzen anstehenden irregulären Medium den von der Feder auf die Dichtung und die Dichtfläche generierten Anpressdruck verstärkt; und
    • bei Wasserentnahme aus dem betreffenden Abgangsstutzen sich entgegen der Wirkung der Feder die Dichtung durch den Strömungsdruck von der Dichtfläche abhebt und damit freier Weg für den Wasserfluss durch die geöffnete Dichtfläche zum genutzten Abgangsstutzen entsteht.
It also applies to this variant that:
  • the housing is substantially plate-shaped;
  • the respective sealing surface is formed by a narrowed inside width in the upper part;
  • the spring is a coil spring acting as a compression spring;
  • a disk-shaped seal base is attached to the free end of the carrier, on which the seal sits; and
  • the components of the backflow preventer in the respective side valve are designed and arranged so that:
    • In the position that acts as a backflow preventer, the pressure from the irregular medium at the outlet connection increases the contact pressure generated by the spring on the seal and the sealing surface; and
    • When water is withdrawn from the outlet connection in question, the seal is lifted from the sealing surface by the flow pressure against the action of the spring, thus creating a free path for the water to flow through the open sealing surface to the outlet connection used.

Kurzbeschreibunq der beigefügten ZeichnungenBrief description of the attached drawings

Es zeigen:

Figur 1A
- einen herkömmlichen Überflurhydranten mit Aufsatzrohr als Oberteil, Steigrohr und Einlaufbogen mit Zuleitung vom Wasserleitungsnetz, in Perspektivdarstellung;
Figur 1B
- den Hydranten gemäss Figur 1A, im Vertikalschnitt;
Figur 2A
- ein Aufsatzrohr als Oberteil erster Variante für einen Überflurhydranten, Rückflussverhinderer geschlossen, im vertikalen Teilschnitt;
Figur 2B
- das Oberteil gemäss Figur 2A, in partieller Explosivdarstellung;
Figur 2C
- die Ventilstangenverlängerung mit dem Spindelaufsatz aus Figur 2A, in Perspektivdarstellung;
Figur 2D
- den Aufbau gemäss Figur 2C, im vertikalen Teilschnitt mit separatem Verschlusskörper;
Figur 2E
- den Aufbau gemäss Figur 2A, Rückflussverhinderer offen, im vertikalen Teilschnitt;
Figur 2F
- das vergrösserte Detail X1 aus Figur 2A;
Figur 2G
- das vergrösserte Detail X2 aus Figur 2E;
Figur 3A
- ein Aufsatzrohr als Oberteil zweiter Variante in EinspindelAusführung für einen Überflurhydranten, Rückflussverhinderer im Seitenventil links offen, Rückflussverhinderer im Seitenventil rechts geschlossen, im vertikalen Teilschnitt, als Prinzipdarstellung;
Figur 3B
- beide Seitenventile aus Figur 3A, im vertikalen Teilschnitt, in perspektivischer partieller Explosivdarstellung;
Figur 3C
- die Anordnung gemäss Figur 3B, in anderer Perspektivansicht;
Figur 3D
- das vergrösserte Detail X3 aus Figur 3C;
Figur 4A
- ein Aufsatzrohr als Oberteil dritter Variante in DreispindelAusführung für einen Überflurhydranten, im vertikalen Teilschnitt, als Prinzipdarstellung;
Figur 4B
- die Situation gemäss Figur 4A: Hauptventil offen, Belüftungsventil im Spindelaufsatz in Schliessstellung, Seitenventil links durch Wasserströmung in Offenstellung, Seitenventil rechts durch Stellung der Gegenmutter geschlossen, im vergrösserten Detail;
Figur 4C
- beide Seitenventile aus Figur 4A, im vertikalen Teilschnitt, in perspektivischer partieller Explosivdarstellung;
Figur 4D
- die Anordnung gemäss Figur 4C, in anderer Perspektivansicht;
Figur 4E
- das vergrösserte Detail X4 aus Figur 4D;
Figur 4F
- die Situation: Hauptventil geschlossen, Belüftungsventil in Offenstellung, Seitenventil links durch Federkraft geschlossen, Seitenventil rechts durch Stellung der Gegenmutter geschlossen; und
Figur 4G
- die Situation: Hauptventil geschlossen, Belüftungsventil in Offenstellung, Seitenventil links durch Federkraft geschlossen, Seitenventil rechts durch Federkraft geschlossen, Gegenmutter in Position "Hydrant ausser Betrieb".
Show it:
Figure 1A
- A conventional post hydrant with an extension pipe as the upper part, riser pipe and inlet bend with supply line from the water supply network, in perspective view;
Figure 1B
- according to the hydrant Figure 1A , in vertical section;
Figure 2A
- An attachment pipe as an upper part of the first variant for a post hydrant, closed backflow preventer, in vertical partial section;
Figure 2B
- the top according to Figure 2A , in partial exploded view;
Figure 2C
- the valve rod extension with the spindle attachment Figure 2A , in perspective view;
Figure 2D
- the structure according to Figure 2C , in vertical partial section with separate closure body;
Figure 2E
- the structure according to Figure 2A , Backflow preventer open, in vertical partial section;
Figure 2F
- the enlarged detail X1 Figure 2A ;
Figure 2G
- the enlarged detail X2 Figure 2E ;
Figure 3A
- a top tube as the upper part of the second variant in a single-spindle design for a post hydrant, backflow preventer in the side valve open on the left, backflow preventer in the side valve on the right closed, in vertical partial section, as a schematic diagram;
Figure 3B
- both side valves off Figure 3A , in vertical partial section, in perspective partial exploded view;
Figure 3C
- the order according to Figure 3B , in another perspective view;
Figure 3D
- the enlarged detail X3 Figure 3C ;
Figure 4A
- an attachment pipe as the upper part of the third variant in three-spindle design for a post hydrant, in vertical partial section, as a schematic representation;
Figure 4B
- the situation according to Figure 4A : Main valve open, ventilation valve in the spindle attachment in closed position, side valve on the left in the open position due to the flow of water, side valve on the right closed by the position of the lock nut, in an enlarged detail
Figure 4C
- both side valves off Figure 4A , in vertical partial section, in perspective partial exploded view;
Figure 4D
- the order according to Figure 4C , in another perspective view;
Figure 4E
- the enlarged detail X4 Figure 4D ;
Figure 4F
- the situation: main valve closed, ventilation valve in open position, side valve on the left closed by spring force, side valve on the right closed by the position of the lock nut; and
Figure 4G
- the situation: main valve closed, ventilation valve in open position, left side valve closed by spring force, right side valve closed by spring force, lock nut in position "hydrant out of order".

AusführungsbeispielEmbodiment

Mit Bezug auf die beiliegenden Zeichnungen erfolgt nachstehend die detaillierte Beschreibung je eines Ausführungsbeispiels des geschaffenen erfindungsgemässen Hydranten mit Rückflussverhinderer zum Einbau in drei verschiedene Varianten von Oberteilen in Gestalt von oberirdisch aufragenden Aufsatzrohren für Überflurhydranten. Dazu ergänzend wird der Einbau des Rückflussverhinderers in ein Oberteil beschrieben, das als unterirdischer Aufsatz für einen Unterflurhydranten konfiguriert ist.With reference to the accompanying drawings, the following is a detailed description of one exemplary embodiment of the hydrant according to the invention with backflow preventer for installation in three different variants of upper parts in the form of above-ground extension pipes for above-ground hydrants. In addition, the installation of the backflow preventer in an upper part is described, which is configured as an underground attachment for an underground hydrant.

Für die gesamte weitere Beschreibung gilt folgende Festlegung. Sind in einer Figur zum Zweck zeichnerischer Eindeutigkeit Bezugsziffern enthalten, aber im unmittelbar zugehörigen Beschreibungstext nicht erläutert, so wird auf deren Erwähnung in vorangehenden oder nachfolgenden Figurenbeschreibungen Bezug genommen. Im Interesse der Übersichtlichkeit wird auf die wiederholte Bezeichnung von Bauteilen in weiteren Figuren zumeist verzichtet, sofern zeichnerisch eindeutig erkennbar ist, dass es sich um "wiederkehrende" Bauteile handelt.The following definition applies to the rest of the description. If reference numbers are included in a figure for the purpose of graphic clarity, but not explained in the directly associated description text, reference is made to their mention in the preceding or following figure descriptions. In the interest of clarity, the repeated designation of components in other figures is mostly dispensed with, provided that it is clearly recognizable in the drawing that the components are "recurring".

Figuren 1A und 1BFigures 1A and 1B

Der herkömmliche Hydrant - hier in Gestalt eines Überflurhydranten ohne die Ausstattung mit einem Rückflussverhinderer - besitzt ein im installierten Zustand oberirdisch aufragendes Aufsatzrohr als Oberteil 1, ein mit dem Oberteil 1 verbundenes und im Erdreich stehendes Steigrohr 6, von dem ein Einlaufbogen zum Wasserleitungsnetz 9 führt. Oben hat das Oberteil 1 einen zur Wasserentnahme dienenden Abgangsstutzen 11 mit einem Schlauchanschluss, und unten - auf Höhe des Erdniveaus - ist das Oberteil 1 von einem Fundamentring 19 umgeben. Vertikal durch das Oberteil 1 erstreckt sich eine Ventilstangenverlängerung 2, die mit einer im Steigrohr 6 vertikal angeordneten Ventilstange 7 verbunden ist. Andererseits ist die Ventilstange 7 mit einem im Steigrohr 6 sitzenden Hauptventil 8 verbunden, welches zwischen einer Schliessstellung und einer zur Wasserentnahme bedingten Offenstellung einstellbar ist und das Absperrorgan zum Wasserleitungsnetz 9 bildet. Die Ventilstangenverlängerung 2 und die Ventilstange 7 ergeben zusammen die Ventilstangenanordnung 2,7. Im unteren Bereich hat das Steigrohr 6 ein Entwässerungsventil 60, welches bei abgestelltem Hydranten zur selbsttätigen Entleerung des im Hydranten gestauten Wassers vorgesehen ist.The conventional hydrant - here in the form of an above-ground hydrant without a backflow preventer - has a top pipe rising above ground when installed as an upper part 1 , a riser 6 connected to the upper part 1 and standing in the ground, from which an inlet bend leads to the water supply network 9 . At the top, the upper part 1 has an outlet connection 11 with a hose connection serving for water extraction, and at the bottom - at the level of the ground - the upper part 1 is surrounded by a foundation ring 19 . A valve rod extension 2 , which is connected to a valve rod 7 arranged vertically in the riser pipe 6, extends vertically through the upper part 1 . On the other hand, the valve rod 7 is seated in the riser 6 with one Main valve 8 connected, which is adjustable between a closed position and an open position required for water withdrawal and forms the shut-off device to the water supply network 9 . The valve rod extension 2 and the valve rod 7 together result in the valve rod assembly 2 , 7. In the lower area, the riser pipe 6 has a drainage valve 60 , which is provided when the hydrant is switched off to automatically empty the water that has accumulated in the hydrant.

Ein zeichnerisch nicht dargestellter Unterflurhydrant weist im Prinzip die gleichen Bauteile auf. Nur hat das Oberteil 1 nun die Gestalt eines Unterfluraufsatzes mit in der Regel wesentlich geringerer Bauhöhe und anders konfiguriertem Abgangsstutzen 11. Dieser Typ Oberteil 1 ist unterirdisch in einem Schacht angeordnet, während das Steigrohr 6 wiederum im Erdreich steht. Es entfällt der Fundamentring 19. An underground hydrant, not shown in the drawing, has in principle the same components. Only the upper part 1 now has the shape of an underfloor attachment with generally much lower overall height and a differently configured outlet connection 11. This type of upper part 1 is arranged underground in a shaft, while the riser 6 is in turn in the ground. The foundation ring 19 is omitted .

Figuren 2A bis 2D und 2FFigures 2A to 2D and 2F

Im Oberteil 1 erster Variante als Aufsatzrohr für einen Überflurhydranten ist der Rückflussverhinderer 3 im Abgangsstutzen 11 eingebaut und wird von dem in den Abgangsstutzen 11 mit Zwischenfügung der Anschlussdichtung 12 eingeschraubten Schlauchanschluss 13 in Position gehalten. Momentan befindet sich der Rückflussverhinderer 3 im geschlossenen Zustand (s. Figuren 2A und 2F).In the upper part 1 of the first variant as an attachment tube for a fire hydrants is installed the return valve 3 in the outlet spigot 11 and is held by the screwed into the outflow pipe 11 with the interposition of the port seal 12 hose connector 13 in position. The backflow preventer 3 is currently in the closed state (see Fig. Figures 2A and 2F ).

Dieser Rückflussverhinderer 3 umfasst zunächst ein kartuschenförmiges Gehäuse 36, dessen Aussenwandung gegenüber der Innenwandung des Abgangsstutzens 11 abgedichtet ist und welches zum Austritt aus dem Abgangsstutzen 11 und zum Oberteil 1 hin jeweils offen ist, wobei die in Richtung Oberteil 1, vom Austritt abgewendet liegende Dichtfläche 360 durch eine verengte lichte Weite gebildet wird. Im Gehäuse 36 ist ein axial beweglicher Träger 32 angeordnet, welcher hinten eine, zum Schlauchanschluss 13 gerichtete röhrchenförmige Federaufnahme 321 hat, der eine tellerartige Dichtungsbasis 323 und zuvorderst ein Aussengewindeabschnitt 324 folgt. Auf dem Aussengewindeabschnitt 324 und auf der Dichtungsbasis 323 aufliegend sitzt die Dichtung 33, welche von der Gegenscheibe 34 und der auf den Aussengewindeabschnitt 324 aufgeschraubten Sicherungsmutter 35 gehalten wird.This non-return valve 3 first comprises a cartridge-shaped housing 36, whose outer wall is sealed against the inner wall of the outlet spigot 11 and which is towards each open to the discharge from the outlet spigot 11 and the upper part 1, wherein the in the direction of the upper part 1, turned away from the outlet sealing surface 360 is formed by a narrowed clearance. In the housing 36 an axially movable carrier 32 is arranged, which has a tubular spring receptacle 321 at the rear facing the hose connection 13 , which is followed by a plate-like sealing base 323 and first of all an externally threaded section 324 . The seal 33 is seated on the externally threaded section 324 and on the seal base 323 and is from the counter disk 34 and the locking nut 35 screwed onto the externally threaded section 324 is held.

Ein Ende der als Druckfeder wirkenden Schraubenfeder 31 steckt in der Federaufnahme 321, während das andere Federende in einem fest im Gehäuse 36 positionierten flügligem Führungsteil 30 ruht, das benachbart zum Austritt aus dem Abgangsstutzens 11 angeordnet ist. Somit stützt sich die Feder 31 einerseits im Führungsteil 30 ab und wirkt andererseits federnd auf den mit der Dichtung 33 versehenen Träger 32 ein. In der als Rückflussverhinderer 3 wirksamen Stellung wird die Dichtfläche 360 von der Dichtung 33 verschlossen. Dabei sind die Bauteile des Rückflussverhinderers 3 sind so gestaltet und angeordnet, dass der Druck vom am Abgangsstutzen 11 anstehenden irregulären Medium der von der Feder 31 auf die Dichtung 33 und die Dichtfläche 360 generierte Anpressdruck verstärkt wird. Somit ist das Einbringen von irregulärem Medium durch den Abgangsstutzen 11 in den Hydranten und letztlich in das Wasserleitungsnetz 9 ausgeschlossen.One end of the helical spring 31 acting as a compression spring is inserted in the spring receptacle 321 , while the other end of the spring rests in a winged guide part 30 which is firmly positioned in the housing 36 and which is arranged adjacent to the outlet from the outlet connection 11 . The spring 31 is thus supported on the one hand in the guide part 30 and on the other hand has a resilient effect on the carrier 32 provided with the seal 33 . In the position that acts as a backflow preventer 3 , the sealing surface 360 is closed by the seal 33 . The components of the backflow preventer 3 are designed and arranged in such a way that the pressure from the irregular medium present at the outlet connection 11 increases the contact pressure generated by the spring 31 on the seal 33 and the sealing surface 360 . The introduction of irregular medium through the outlet connection 11 into the hydrant and ultimately into the water supply network 9 is thus excluded.

Nach dem Gebrauch des Hydranten und dann geschlossenem Hauptventil 8 verbleibt zunächst im Hydranten gestautes Wasser, welches insbesondere zum Frostschutz selbsttätig entleert werden muss. Hierzu dient das im Steigrohr 6 vorgesehene Entwässerungsventil 60 als temporäre Öffnung zum Erdreich. Gemäss Stand der Technik konnte die Belüftung des Hydranten für die selbsttätige Wasser-Entleerung bis anhin durch den Schlauchanschluss 13 in den Abgangsstutzen 11 erfolgen.After the hydrant has been used and the main valve 8 is closed, water initially remains in the hydrant, which water must be drained automatically, in particular for frost protection. For this purpose, the drainage valve 60 provided in the riser 6 serves as a temporary opening to the ground. According to the state of the art, ventilation of the hydrant for automatic water drainage has so far been possible through the hose connection 13 in the outlet nozzle 11 .

Als neue Lösung für die Belüftung wird nun im Spindelaufsatz 20, der auf der Ventilstangenverlängerung 2 montiert ist, ein Belüftungsventil 5 vorgesehen, welches einen als Schwimmer ausgebildeten Verschlusskörper 50 besitzt. Bei geschlossenem Hauptventil 8 sinkt die im Hydranten stehende Wassersäule und damit senkt sich der Verschlusskörper 50 von der Belüftungsöffnung 200 aus der vorherigen begrenzten Schliessposition in die begrenzte Offenstellung ab. Infolge weiteren Nachströmens von Umgebungsluft aus der Atmosphäre durch die nun freie Belüftungsöffnung 200 geschieht selbsttätig die vollständige Entleerung über das Entwässerungsventil 60 in das Erdreich. Der Strömungsweg für die über das Belüftungsventil 5 in den Hydranten zu dessen Entleerung benötigte einströmende Umgebungsluft verläuft somit nun nicht mehr durch den Abgangsstutzen 11. As a new solution for ventilation, a ventilation valve 5 is now provided in the spindle attachment 20 , which is mounted on the valve rod extension 2 , which has a closure body 50 designed as a float. When the main valve 8 is closed, the water column standing in the hydrant sinks and thus the closure body 50 lowers from the ventilation opening 200 from the previous limited closed position into the limited open position. As a result of further inflow of ambient air from the atmosphere through the ventilation opening 200 that is now free, complete emptying takes place automatically the drain valve 60 into the ground. The flow path for the ambient air flowing into the hydrant via the ventilation valve 5 for emptying it thus no longer runs through the outlet connection 11.

Der Spindelaufsatz 20 steckt im oberen Ende der Ventilstangenverlängerung 2, die in einem Nestraum 17 endet. Auf dem Spindelaufsatz 20, an dem oben die Belüftungsöffnung 200 mündet, stecken zuunterst eine Positionierhülse 23, darüber eine Spindeldichtung 22 und zuoberst ein Abstreifring 21, die allesamt im Nestraum 17 ruhen. Die vertikale Bewegungsfreiheit des Verschlusskörpers 50 wird durch ein aufgestecktes Sicherungselement 24 und komplementäre Konturen am Verschlusskörper 50 und im Nestraum 17 limitiert. Eine auf das Oberteil 1 aufsteckbare Schutzkappe 10 dient als Abdeckung zum Spindelaufsatz 20. The spindle attachment 20 is located in the upper end of the valve rod extension 2 , which ends in a nest space 17 . On the spindle attachment 20 , at which the ventilation opening 200 opens at the top, a positioning sleeve 23 is placed at the bottom, a spindle seal 22 above and a scraper ring 21 at the top, all of which rest in the nest space 17 . The vertical freedom of movement of the closure body 50 is limited by an attached securing element 24 and complementary contours on the closure body 50 and in the nest space 17 . A protective cap 10 that can be slipped onto the upper part 1 serves as a cover for the spindle attachment 20.

Figuren 2E und 2GFigures 2E and 2G

Bei geöffnetem Hauptventil 8 und erst damit ermöglichter Wasserentnahme aus dem Abgangsstutzen 11 entfernt sich durch den Strömungsdruck entgegen der Wirkung der Feder 31 die Dichtung 33 von der Dichtfläche 360, so dass ein freier Weg für den Wasserfluss durch das Gehäuse 36 zum Austritt besteht. Zugleich wird der Verschlusskörper 50 des Belüftungsventils 5 vom Wasserstand im Hydranten - also auch im Spindelaufsatz 20 - angehoben und somit in die Schliessposition gebracht. Damit ist der Wasseraustritt durch die Belüftungsöffnung 200 blockiert.When the main valve 8 is open and water can only be withdrawn from the outlet connection 11 by the flow pressure, the seal 33 moves away from the sealing surface 360 against the action of the spring 31 , so that there is a free path for the water to flow through the housing 36 to the outlet. At the same time, the closure body 50 of the ventilation valve 5 is raised by the water level in the hydrant - that is, also in the spindle attachment 20 - and is thus brought into the closed position. The water outlet through the ventilation opening 200 is thus blocked.

Figuren 3A bis 3DFigures 3A to 3D

Diese Figurenfolge betrifft ein Aufsatzrohr als Oberteil 1 zweiter Variante in Ein-spindel-Ausführung mit zwei Seitenventilen SVlinks,SVrechts und zwei Abgangsstutzen 11 für einen Überflurhydranten. Die Abgangsstutzen 11 sind jeweils mit einem Schlauchanschluss 13 und einer zwischengefügten Anschlussdichtung 12 versehen. Bei offenem Hauptventil 8 steht an beiden Abgangsstutzen 11 Wasser an, da die Seitenventile SVlinks,SVrechts bei dieser Ausführungsform des Oberteils 1 weder zusammen noch separat bedienbar sind. Vertikal innerlich des Oberteils 1 erstreckt sich die Ventilstangenverlängerung 2 mit dem oben anmontierten Spindelaufsatz 20, der innerhalb eines auf das Oberteil 1 aufgesetzten Kappenunterteils 14 zugänglich wird, wenn man die das Kappenunterteil 14 abdeckende Schutzkappe 10 öffnet.This sequence of figures relates to an attachment pipe as upper part 1, second variant, in a single-spindle design with two side valves SV left , SV right and two outlet nozzles 11 for a post hydrant. The outlet nozzles 11 are each provided with a hose connection 13 and an interposed connection seal 12 . When the main valve 8 is open, water is present at both outlet nozzles 11 , since the side valves SV left , SV right in this embodiment of the upper part 1 can not be operated either together or separately. Vertically inside the upper part 1 , the valve rod extension 2 extends with the top mounted Spindle attachment 20 , which is accessible within a lower cap part 14 placed on the upper part 1 when the protective cap 10 covering the lower cap part 14 is opened.

Die beiden Seitenventile SVlinks,SVrechts sind in einem plattenähnlichen Gehäuse 46, welches horizontal auf dem Oberteil 1 ruht, eingebaut. Unterhalb und fluchtend zu jedem der Seitenventile SVlinks,SVrechts befindet sich im Oberteil 1 eine Dichtfläche 16, die als verengte lichte Weite gestaltet ist. Bei dieser Version des Oberteils 1 wird der konstruktiv angepasste Rückflussverhinderer 4 vom jeweiligen Seitenventil SVlinks,SVrechts gebildet. Der Rückflussverhinderer 4 im linken Seitenventil SVlinks ist offen, hingegen im rechten Seitenventil SVrechts geschlossen (s. Figur 3A). Diese Situation existiert nicht in der Realität, sondern soll lediglich die möglichen Stellungen der Seitenventile SVlinks,SVrechts illustrieren. Entweder wären beide Seitenventile SVlinks,SVrechts in Offenstellung, nämlich durch den Wasserdruck, wenn das Hauptventil 8 geöffnet ist. Oder bei geschlossenem Hauptventil 8 sind durch die Wirkung der beiden Federn 41 auch beide Seitenventile SVlinks,SVrechts geschlossen. Die Situation "einseitig zu" kann allerdings entstehen, wenn der Strömungsweg über eines der beiden Seitenventile SVlinks,SVrechts dadurch blockiert ist, dass der mit dem betreffenden Seitenventil SVlinks,SVrechts verbundene Schlauch oder sonstige Verbraucher am Ende verschlossen ist, typisch z.B. bei einem Strahlrohr der Feuerwehr.The two side valves SV left , SV right are installed in a plate-like housing 46 which rests horizontally on the upper part 1 . Below and in alignment with each of the side valves SV left , SV right, there is a sealing surface 16 in the upper part 1 , which is designed as a narrowed inside width. In this version of the upper part 1 , the structurally adapted backflow preventer 4 is formed by the respective side valve SV left , SV right . The check valve 4 in the left side valve SV is left (closed open, while the right side valve SV right s. Figure 3A ). This situation does not exist in reality, but is only intended to illustrate the possible positions of the side valves SV left , SV right . Either both side valves SV left , SV right would be in the open position, namely by the water pressure when the main valve 8 is open. Or when the main valve 8 is closed, the action of the two springs 41 also closes both side valves SV left , SV right . The "one-sided closed" situation can arise, however, when the flow path via one of the two side valves SV left , SV right is blocked by the fact that the hose or other consumer connected to the relevant side valve SV left , SV right is closed at the end, typically e.g. at a fire brigade nozzle.

Die Belüftung des Hydranten mittels des Belüftungsventils 5 für die selbsttätige Wasser-Entleerung bei geschlossenem Hauptventil 8 und der Verschluss der Belüftungsöffnung 200 bei offenem Hauptventil 8 sind zur Ausführung gemäss den Figuren 2A bis 2E identisch.The ventilation of the hydrant by means of the ventilation valve 5 for automatic water drainage when the main valve 8 is closed and the closure of the ventilation opening 200 when the main valve 8 is open are for the execution according to FIGS Figures 2A to 2E identical.

Das Gehäuse 46 hat eine zentral positionierte Spindeldurchführung 460 zum vertikalen Durchtritt der Ventilstangenverlängerung 2 und beidseits der Spindeldurchführung 460 jeweils eine Vertikalpassage 466 zur jeweiligen Aufnahme eines feststehenden, stabförmigen Führungsteils 40 mit aufgesteckter Feder 41 und damit verbundenem kartuschenartigem Träger 42. In den Buchsensitz 461 und den Dichtungssitz 462 der Spindeldurchführung 460 sind der Abstreifring 21 bzw. die Spindeldichtung 22 eingesetzt, die vom Spindelaufsatz 20 durchdrungen werden. Das Führungsteil 40 steckt teleskopisch verschiebbar im Träger 42, nämlich in seiner axialen, einen zylindrischen Freiraum bildenden Federaufnahme 421. Die Feder 41 wird zwischen einem oben auf der betreffenden Vertikalpassage 466 mit den Schrauben 428 befestigten Deckel 427 - unter diesem ist der Abstreifring 426 eingefügt - und unten dem Träger 42 eingespannt, der axial verschiebbar in der Vertikalpassage 466 geführt ist. Die Feder 41 ist wiederum eine als Druckfeder wirkende Schraubenfeder. Unten am Träger 42 ist mittels eines Verbindungselements 424, z.B. einer Schraube, eine Gegenscheibe 44 befestigt. Von unten an die Gegenscheibe 44 ist die ebenfalls scheibenförmige Dichtungsbasis 423 mit den Schrauben 429 und den Muttern 45 angebaut. Zuunterst an der Kombination aus Gegenscheibe 44 und Dichtungsbasis 423 sitzt die Dichtung 43. The housing 46 has a centrally positioned spindle leadthrough 460 for the vertical passage of the valve rod extension 2 and on both sides of the spindle leadthrough 460 each have a vertical passage 466 for receiving a fixed, rod-shaped guide part 40 with an attached spring 41 and thus connected cartridge-like carrier 42. The wiper ring 21 and the spindle seal 22 , which are penetrated by the spindle attachment 20, are inserted into the socket seat 461 and the seal seat 462 of the spindle leadthrough 460 . The guide part 40 is telescopically slidable in the support 42 , namely in its axial spring receptacle 421 , which forms a cylindrical free space . The spring 41 is between a cover 427 fastened on top of the relevant vertical passage 466 with the screws 428 - below this the wiper ring 426 is inserted - and clamped below the carrier 42 , which is axially displaceably guided in the vertical passage 466 . The spring 41 is in turn a helical spring acting as a compression spring. A counter-disk 44 is fastened to the bottom of the carrier 42 by means of a connecting element 424 , for example a screw. The disk-shaped sealing base 423 with the screws 429 and the nuts 45 is attached to the counter disk 44 from below. The seal 43 is seated at the bottom of the combination of counter-disk 44 and seal base 423 .

Die innerlich des Oberteils 1 für jedes der Seitenventile SVlinks,SVrechts vorhandene Dichtfläche 16 wird von der jeweiligen Dichtung 43 in der als Rückflussverhinderer 4 wirksamen Stellung verschlossen. Die Bauteile des Rückflussverhinderers 4 im jeweiligen Seitenventil SVlinks,SVrechts sind erneut so gestaltet und angeordnet, dass in der als Rückflussverhinderer 4 wirksamen Stellung - also bei geschlossenem Hauptventil 8 - der Druck von einem am Abgangsstutzen 11 anstehenden irregulären Medium den von der Feder 41 auf die Dichtung 43 und die Dichtfläche 16 generierten Anpressdruck verstärkt. Bei Wasserentnahme aus dem betreffenden Abgangsstutzen 11 - nur möglich bei offenem Hauptventil 8 - hebt sich entgegen der Wirkung der Feder 41 die Dichtung 43 durch den Strömungsdruck von der Dichtfläche 16 ab und damit entsteht ein freier Weg für den Wasserfluss durch die geöffnete Dichtfläche 16 zum genutzten Abgangsstutzen 11. The sealing surface 16 present inside the upper part 1 for each of the side valves SV left , SV right is closed by the respective seal 43 in the position that acts as a backflow preventer 4 . The components of the backflow preventer 4 in the respective side valve SV left , SV right are again designed and arranged in such a way that in the position effective as backflow preventer 4 - i.e. with the main valve 8 closed - the pressure of an irregular medium at the outlet connection 11 is that of the spring 41 increased contact pressure generated on the seal 43 and the sealing surface 16 . When water is withdrawn from the relevant outlet connection 11 - only possible when the main valve 8 is open - the seal 43 is lifted against the action of the spring 41 by the flow pressure from the sealing surface 16 and this creates a free path for the water to flow through the open sealing surface 16 to the used one Outlet nozzle 11.

Figur 4A bis 4GFigures 4A to 4G

Diese Figurenfolge betrifft ein Aufsatzrohr als Oberteil 1 dritter Variante in Drei-spindel-Ausführung mit zwei Seitenventilen SVlinks,SVrechts und zwei Abgangsstutzen 11 für einen Überflurhydranten. Die Abgangsstutzen 11 sind wiederum jeweils mit einem Schlauchanschluss 13 und einer zwischengefügten Anschlussdichtung 12 versehen. Bei offenem Hauptventil 8 steht das Wasser zunächst nur an den beiden Seitenventile SVlinks,SVrechts an, wenn diese jeweils geschlossen sind. Bei dieser Ausführungsform des Oberteils 1 sind die Seitenventile SVlinks,SVrechts nämlich durch Betätigung der jeweiligen Seitenventilspindel 25 separat bedienbar. Innerlich des Oberteils 1 wiederum erstreckt sich vertikal die Ventilstangenverlängerung 2 mit dem oben angeordneten Spindelaufsatz 20, der im auf das Oberteil 1 aufgesetzten Kappenunterteil 14 verborgen ist, aber zugänglich wird, wenn man die das Kappenunterteil 14 abdeckende Schutzkappe 10 öffnet.This sequence of figures relates to an attachment pipe as an upper part 1, third variant, in a three-spindle design with two side valves SV left , SV right and two outlet nozzles 11 for a post hydrant. The outlet nozzles 11 are in turn each provided with a hose connection 13 and an interposed connection seal 12 . When the main valve 8 is open, the water is initially only available at the two side valves SV left and SV right when these are each closed. In this embodiment of the upper part 1 , the side valves SV left , SV right can be operated separately by actuating the respective side valve spindle 25 . Inside the upper part 1, in turn, the valve rod extension 2 extends vertically with the spindle attachment 20 located above, which is hidden in the lower cap part 14 placed on the upper part 1 , but becomes accessible when the protective cap 10 covering the lower cap part 14 is opened.

Abgesehen von der nun für jedes der beiden Seitenventile SVlinks,SVrechts vorhandenen Seitenventilspindel 25, Gegenmutter 26 sowie zusätzlichen Dichtung 425 und dem nicht mehr benötigten Führungsteil 40, entspricht der Aufbau der Seitenventile SVlinks,SVrechts weitgehend der Vorgängervariante gemäss den Figuren 3A bis 3D, so dass sich hierfür eine Wiederholung der betreffenden Passagen der Figurenbeschreibung erübrigt. Die Baueinheit aus Gegenscheibe 44, Dichtungsbasis 423, Verbindungselement 424, Schrauben 429, Dichtung 43 und Muttern 45 ist wie bei der Vorgängervariante gemäss Figuren 3B bis 3D beschaffen und am Träger 42 befestigt. Identisch sind auch die Beschaffenheit und Positionierung der Dichtflächen 16. Apart from the side valve spindle 25 , lock nut 26 as well as additional seal 425 and the no longer required guide part 40 , which are now available for each of the two side valves SV left , SV right , the structure of the side valves SV left , SV right largely corresponds to the predecessor variant according to FIGS Figures 3A to 3D so that a repetition of the relevant passages of the description of the figures is unnecessary. The assembly consisting of the counter disk 44 , seal base 423 , connecting element 424 , screws 429 , seal 43 and nuts 45 is as in the previous variant Figures 3B to 3D procure and attached to the carrier 42 . The nature and positioning of the sealing surfaces 16 are also identical .

Im zusammengebauten Zustand ist oben auf dem Gehäuse 46 mit den Schrauben 428 über jeder der beiden Vertikalpassagen 466 ein Deckel 427 mit Zwischenfügung eines Abstreifrings 426 befestigt. Auf dem Deckel 427 sitzt mit Zwischenfügung einer weiteren Dichtung 425 eine drehbare aber axial feststehende Seitenventilspindel 25, auf deren Gewindeschaft 250 die axial verstellbare aber radial arretierte Gegenmutter 26 aufgeschraubt ist, welche in der Vertikalpassage 466 geführt wird. Der die Vertikalpassage 466 durchragende Gewindeschaft 250 erstreckt sich in den Träger 42, der begrenzt in der Vertikalpassage 466 verschiebbar angeordnet ist. Die komprimierbare Feder 41 steckt auf dem Gewindeschaft 250 und ist zwischen der Gegenmutter 26 und einem Fixpunkt in der Federaufnahme 421 des Trägers 42 eingespannt.In the assembled state, a cover 427 with an interposed wiper ring 426 is attached to the top of the housing 46 with the screws 428 over each of the two vertical passages 466 . A rotatable but axially fixed side valve spindle 25 is seated on the cover 427 with the interposition of a further seal 425 , the axially adjustable but radially locked counter nut 26 , which is guided in the vertical passage 466 , is screwed onto the threaded shaft 250 . The threaded shaft 250 protruding through the vertical passage 466 extends into the carrier 42 , which is arranged displaceably to a limited extent in the vertical passage 466 . The compressible spring 41 is on the threaded shaft 250 and is clamped between the counter nut 26 and a fixed point in the spring receptacle 421 of the carrier 42 .

Die Baueinheit aus Gegenscheibe 44, Dichtungsbasis 423, Verbindungselement 424, Schrauben 429, Dichtung 43 und Muttern 45 ist wie bei der Vorgängervariante gemäss Figuren 3B bis 3D beschaffen und am Träger 42 befestigt. Identisch sind auch die Beschaffenheit und Positionierung der Dichtflächen 16. The assembly consisting of the counter disk 44 , seal base 423 , connecting element 424 , screws 429 , seal 43 and nuts 45 is as in the previous variant Figures 3B to 3D procure and attached to the carrier 42 . The nature and positioning of the sealing surfaces 16 are also identical .

Die Belüftung des Hydranten mittels des Belüftungsventils 5 für die selbsttätige Wasser-Entleerung bei geschlossenem Hauptventil 8 und der Verschluss der Belüftungsöffnung 200 bei offenem Hauptventil 8 sind wiederum zur Ausführung gemäss den Figuren 2A bis 2E identisch.The ventilation of the hydrant by means of the ventilation valve 5 for the automatic drainage of water when the main valve 8 is closed and the closure of the ventilation opening 200 when the main valve 8 is open are again for the embodiment according to FIGS Figures 2A to 2E identical.

Figuren 4A und 4BFigures 4A and 4B

Durch die separate Absperrbarkeit beider Seitenventile SVlinks,SVrechts widerspiegelt dieses Figurenpaar eine real mögliche unterschiedliche Stellung beider Seitenventile SVlinks,SVrechts bzw. Rückflussverhinderer 4. Der Rückflussverhinderer 4 im linken Seitenventil SVlinks ist offen, hingegen im rechten Seitenventil SVrechts geschlossen. Diese Situation entsteht, wenn das Hauptventil 8 und zugleich das linke Seitenventil SVlinks offen sind, also Wasser am linken Abgangsstutzen abgenommen werden kann. Vom anstehenden Wasserdruck wird das unarretierte linke Seitenventil SVlinks gemäss der oberen Position der Gegenmutter 26 entgegen der Wirkung der aufwärts komprimierten Feder 41 in die Offenstellung gedrückt. Der Träger 42 schiebt sich aufwärts in die betreffende Vertikalpassage 466 hinein. Das rechte Seitenventil SVrechts hingegen ist gemäss der unteren Position der Gegenmutter 26 in Schliessstellung arretiert, so dass der Wasserdruck keine Öffnung bewirken kann. Von der Gegenmutter 26 wird die Feder 41 maximal abwärts komprimiert und dabei der Träger 42 abwärts in der betreffende Vertikalpassage 466 ausgeschoben. Das Belüftungsventil 5 ist infolge des in der Ventilstangenverlängerung 2 stehenden Wassers geschlossen, der Verschlusskörper 50 erfährt Auftrieb in seine Schliessstellung.The separate Absperrbarkeit both side valves SV left SV right this pair of figures The check valve 4 in the left side valve SV reflects a real possible different position of both side valves SV left SV right or backflow preventer fourth left is closed open, while the right side valve SV right. This situation arises when the main valve 8 and also the left side valve SV are left open, so water can be taken from the left outlet spigot. From the existing water pressure, the unlocked left side valve SV left is pressed into the open position according to the upper position of the lock nut 26 against the action of the upwardly compressed spring 41 . The carrier 42 slides upward into the relevant vertical passage 466 . The right side valve SV on the right, however, is locked in the closed position according to the lower position of the lock nut 26 , so that the water pressure cannot cause an opening. The spring 41 is compressed maximally downwards by the lock nut 26 and the carrier 42 is pushed out downwards into the relevant vertical passage 466 . The ventilation valve 5 is closed as a result of the water standing in the valve rod extension 2 , and the closure body 50 is lifted into its closed position.

Figuren 4D, 4E und linkes Seitenventil in Figur 4FFigures 4D, 4E and left side valve in Figure 4F

Der Hydrant steht momentan nicht unter Druck, da das Hauptventil 8 entweder geschlossen oder der Hydrant gar nicht am Wasserleitungsnetz 9 oder momentan das Wasserleitungsnetz 9 drucklos ist. Hier ist der Rückflussverhinderer 4 im linken Seitenventil SVlinks gemäss der oberen Position der Gegenmutter 26 unarretiert, jedoch durch die Wirkung der Feder 41 in die geschlossene Stellung gedrückt. Die Feder 41 hat sich aufwärts und abwärts ausgedehnt. Der Träger 42 hat sich maximal abwärts aus der betreffende Vertikalpassage 466 bewegt. Gezeigte Situation ergibt sich, wenn sich dieses Seitenventil SVlinks in Offenstellung befindet, jedoch kein Wasserdruck einwirkt. Das Belüftungsventil 5 wäre offen, denn durch den fehlenden Auftrieb sinkt der Verschlusskörper 50 in seine Offenstellung.The hydrant is currently not under pressure because the main valve 8 is either closed or the hydrant is not at all on the water pipe network 9 or the water pipe network 9 is currently depressurized. Here, the non-return valve 4 is unarretiert left according to the upper position of the lock nut 26 in the left side of valve SV, however, pushed by the action of the spring 41 in the closed position. The spring 41 has expanded upwards and downwards. The carrier 42 has moved maximally downward out of the relevant vertical passage 466 . The situation shown arises when this side valve SV is in the open position on the left , but no water pressure is acting. The ventilation valve 5 would be open because the lack of buoyancy causes the closure body 50 to sink into its open position.

Rechtes Seitenventil in Figur 4FRight side valve in Figure 4F

Der Hydrant steht momentan nicht unter Druck - z.B. weil das Hauptventil 8 geschlossen ist - dennoch wird infolge der unteren Position der Gegenmutter 26 der Rückflussverhinderer 4 im rechten Seitenventil SVrechts in Schliessstellung arretiert, also die zugehörige Dichtfläche 16 von der aufsetzenden Dichtung 43 verschlossen. Die Feder 41 wird von der Gegenmutter 26 abwärts gedrückt, hat sich maximal abwärts bewegt und dabei den Träger 42 maximal aus der betreffenden Vertikalpassage 466 abwärts ausgetrieben. Durch den fehlenden Auftrieb sinkt der Verschlusskörper 50, das Belüftungsventil 5 nimmt Offenstellung ein.Currently, the hydrant is not under pressure - for example, because the main valve 8 is closed - yet the locknut so the associated sealing surface 16, 26 of the return valve 4 is locked to the right in the closed position in the right side of valve SV due to the lower position, closed by the-engaging seal 43rd The spring 41 is pressed downwards by the lock nut 26 , has moved downwards to the maximum and thereby driven the carrier 42 downwards to the maximum extent from the relevant vertical passage 466 . Due to the lack of buoyancy, the closure body 50 sinks, the ventilation valve 5 assumes an open position.

Figur 4GFigure 4G

Die Situation im linken Seitenventil SVlinks ist identisch zu den Stellungen im linken Seitenventil SVlinks gemäss Figur 4F, wie es unmittelbar vor dem Gebrauch des Hydranten bzw. unmittelbar nach seiner Ausserbetriebsetzung wäre.The situation in the left side valve SV on the left is identical to the positions in the left side valve SV on the left according to Figure 4F as it would be immediately before the hydrant was used or immediately after it was taken out of service.

Am rechten Seitenventil SVrechts wird der Zustand illustriert, wenn der Hydrant ausser Betrieb ist. Hierbei wird die Seitenventilspindel 25 nicht ganz fest in Arretierposition gestellt, sondern ca. eine Umdrehung geöffnet, so dass sich die Gegenmutter 26 einen Spalt vom Träger 42 entfernt hat. Die zwischen der Gegenmutter 26 und dem Träger 42 sich leicht entspannte Feder 41 hält den zugehörigen Rückflussverhinderer 4 geschlossen, aber presst die Dichtung 43 nicht mit maximaler Schliesskraft auf die betreffende Dichtfläche 16. Somit wird der Hydrant auch im ausser Betrieb gesetztem Zustand vor dem Einbringen von irregulärem Medium geschützt und zugleich die aufeinandersitzende Dichtfläche 16 und Dichtung 43 weniger strapaziert, so dass sich die Dichtung 43 bei Inbetriebnahme unproblematisch wieder lösen lässt. Durch den fehlenden Auftrieb gelangt das Belüftungsventil 5 in Offenstellung.On the right side valve SV right of the state is illustrated when the hydrant is out of service. In this case, the side valve spindle 25 is not placed completely firmly in the locking position, but is opened approximately one turn so that the lock nut 26 has removed a gap from the carrier 42 . The spring 41 , which is slightly relaxed between the counter nut 26 and the support 42 , keeps the associated backflow preventer 4 closed, but does not press the seal 43 with maximum closing force onto the relevant sealing surface 16. Thus, the hydrant is closed even when it is inoperative before it is introduced Irregular medium is protected and at the same time the sealing surface 16 and seal 43, which are seated on one another, are less stressed, so that the seal 43 can be loosened again without problems when it is put into operation. Due to the lack of buoyancy, the ventilation valve 5 moves into the open position.

Claims (10)

  1. Hydrant configured as an overground hydrant for installation in a water supply network (9), having:
    a) a top part (1) in the form of an attachment pipe which is to be installed so as to project upwards overground and has at least one outlet piece (11) serving for the removal of water;
    b) a valve rod extension (2) which is arranged vertically in the top part (1);
    c) a riser pipe (6) which is connected at the bottom to the top part (1) and has a valve rod (7) extending vertically therein; wherein:
    ca) the valve rod (7) is connected at one side to the valve rod extension (2) and forms, in combination, a valve rod arrangement (2,7); and
    cb) the valve rod (7) is connected at the other side to a main valve (8), which leads to the water supply network (9) and is settable between a closed position and an open position required for removal of water;
    d) at least one backflow preventer (3,4) which is provided in the top part (1) and is in the form of a mechanical arrangement having a seal (33,43) supported by a spring (31,41), which seal is intended for the closure of a sealing surface (16,360) situated in the flow path to the water supply network (9); and
    e) a drain valve (60) in the riser pipe (6), which drain valve is provided for automatic emptying of water dammed in the hydrant with the hydrant shut off; wherein:
    fa) the hydrant is designed as a one-spindle hydrant having the at least one outlet piece (11) and having the valve rod arrangement (2,7) for actuating the main valve (8); or
    fb) the hydrant is designed as a three-spindle hydrant having two outlet pieces (11) and having the valve rod arrangement (2,7) for actuating the main valve (8) and having two side valves (SVleft,SVright ) for in each case separate opening or shutting off of the two outlet pieces (11) provided; and
    fc) the backflow preventer (3,4) is arranged in the respective outlet piece (11) of the top part (1) or in the respective side valve (SVleft,SVright ) of the top part (1);
    g) an aeration valve (5) which:
    ga) permits the inflow of ambient air into the hydrant with the hydrant shut off and with the main valve (8) closed, in order to allow automatic emptying of the water dammed in the hydrant through the drain valve (60); and
    gb) blocks the flow of water through the aeration valve (5) into the surroundings with the main valve (8) open; wherein
    h) the flow path for the ambient air flowing into the hydrant via the aeration valve (5) bypasses the at least one backflow preventer (3,4) arranged in the top part (1) and the at least one outlet piece (11) provided, characterized in that
    i) the aeration valve (5) has a closure body (50) which is in the form of a float and which is installed into the upper end of a spindle attachment (20) mounted onto the valve rod extension (2) and which closes off or opens up an aeration opening (200) into the atmosphere.
  2. Hydrant configured as an underground hydrant for installation in a water supply network (9), having:
    a) a top part (1) having the form of an underground attachment which, together with a riser pipe (6), is to be installed so as to be concealed underground and has at least one outlet piece (11) serving for the removal of water;
    b) a valve rod extension (2) which is arranged vertically in the top part (1);
    c) a riser pipe (6) which is connected at the bottom to the top part (1) and has a valve rod (7) extending vertically therein; wherein:
    ca) the valve rod (7) is connected at one side to the valve rod extension (2) and forms, in combination, a valve rod arrangement (2,7); and
    cb) the valve rod (7) is connected at the other side to a main valve (8), which leads to the water supply network (9) and is settable between a closed position and an open position required for removal of water;
    d) at least one backflow preventer (3,4) which is provided in the top part (1) and is in the form of a mechanical arrangement having a seal (33,43) supported by a spring (31,41), which seal is intended for the closure of a sealing surface (16,360) situated in the flow path to the water supply network (9); and
    e) a drain valve (60) in the riser pipe (6), which drain valve is provided for automatic emptying of water dammed in the hydrant with the hydrant shut off; wherein:
    f) the backflow preventer (3,4) is arranged in the respective outlet piece (11) of the top part (1);
    g) an aeration valve (5) which:
    ga) permits the inflow of ambient air into the hydrant with the hydrant shut off and with the main valve (8) closed, in order to allow automatic emptying of the water dammed in the hydrant through the drain valve (60); and
    gb) blocks the flow of water through the aeration valve (5) into the surroundings with the main valve (8) open; wherein
    h) the flow path for the ambient air flowing into the hydrant via the aeration valve (5) bypasses the at least one backflow preventer (3,4) arranged in the top part (1) and the at least one outlet piece (11) provided, characterized in that
    i) the aeration valve (5) has a closure body (50) which is in the form of a float and which is installed into the upper end of a spindle attachment (20) mounted onto the valve rod extension (2) and which closes off or opens up an aeration opening (200) into the atmosphere.
  3. Hydrant according to Claims 1 and 2, characterized in that the backflow preventer (3) intended for installation into an outlet piece (11) comprises:
    a) a housing (36) whose outer wall is sealed off with respect to the inner wall of the outlet piece (11); and
    b) a carrier (32) which is movable axially in the housing (36) and is supported by the spring (31) and is provided with the seal (33).
  4. Hydrant according to Claim 3, characterized in that the backflow preventer (3) also comprises:
    a) a guide part (30) which is arranged fixedly in the housing (36) and adjacent to the exit from the outlet piece (11), and in which one end of the spring (31) is situated while the other end of the spring (31) acts on the carrier (32); and
    b) the sealing surface (360) provided at the housing (36), which sealing surface is remote from the exit from the outlet piece (11) and is closed off by the seal (33) in the position effective as backflow preventer (3).
  5. Hydrant according to at least either of Claims 3 and 4, characterized in that the housing (36) is like a cartridge and is open towards the exit from the outlet piece (11) and towards the top part (1) in each case, wherein the sealing surface (360), which is situated in the direction of the top part (1), is formed by way of a narrowed internal diameter.
  6. Hydrant according to at least one of Claims 3 to 5, characterized in that
    a) the spring (31) is a helical spring acting as a compression spring;
    b) the carrier (32) has a spring receiving part (321), on which the spring (31) engages, and a disc-like seal base (323), on which the seal (33) is arranged; and
    c) the components of the backflow preventer (3) are configured and arranged such that:
    ca) in the position effective as backflow preventer (3), the pressure from irregular medium present at the outlet piece (11) boosts the contact pressure generated from the spring (31) to the seal (33) and the sealing surface (360); and
    cb) in the case of removal of water from the outlet piece (11), the seal (33), counter to the action of the spring (31), is removed from the sealing surface (360) by way of the flow pressure and, in this way, there is a free path for the flow of water through the housing (36) to the exit.
  7. Hydrant according to Claim 1, characterized in that the respective backflow preventer (4) intended for installation into both of the side valves (SVleft,SVright ) has a housing (46), installed horizontally into the top part (1), with a centrally positioned spindle leadthrough (460) and, on both sides of the spindle leadthrough (460), in each case one vertical passage (466), wherein:
    a) the spindle leadthrough (460) serves for vertically passing through the valve rod extension (2);
    b) the vertical passages (466) are provided for respectively receiving a fixed guide part (40) with a spring (41) plugged thereon and with a carrier (42) connected thereto;
    c) the guide part (40) is situated in the carrier (42) in a telescopically displaceable manner, and the spring (41) is clamped between a cover (427) fastened at the top on the respective vertical passage (466) and, at the bottom, the carrier (42), which is guided in an axially displaceable manner in the vertical passage (466);
    d) the carrier (42) has a seal (43) at the bottom; and
    e) a sealing surface (16) is provided inside the top part (1) for each of the side valves (SVleft,SVright ) and is closed off by the respective seal (43) in the position effective as backflow preventer (4).
  8. Hydrant according to Claim 7, characterized in that
    a) the housing (46) is of substantially plate-like form;
    b) the respective sealing surface (16) is formed by way of a narrowed internal diameter in the top part (1);
    c) the spring (41) is a helical spring acting as a compression spring;
    d) the guide part (40) has the shape of a rod;
    e) a disc-like seal base (423), on which the seal (43) is seated, is fastened to the free end of the carrier (42); and
    f) the components of the backflow preventer (4) in the respective side valve (SVleft, SVright ) are configured and arranged such that:
    fa) in the position effective as backflow preventer (4), the pressure from irregular medium present at the outlet piece (11) boosts the contact pressure generated from the spring (41) to the seal (43) and the sealing surface (16); and
    fb) in the case of removal of water from the respective outlet piece (11), the seal (43), counter to the action of the spring (41), is lifted off from the sealing surface (16) by way of the flow pressure and, in this way, a free path for the flow of water through the opened sealing surface (16) to the used outlet piece (11) is formed.
  9. Hydrant according to Claim 1, characterized in that the respective backflow preventer (4) intended for installation into both of the side valves (SVleft,SVright ) has a housing (46), installed horizontally into the top part (1), with a centrally positioned spindle leadthrough (460) and, on both sides of the spindle leadthrough (460), in each case one vertical passage (466), wherein:
    a) the spindle leadthrough (460) serves for vertically passing through the valve rod extension (2);
    b) the vertical passages (466) are provided for respectively receiving a rotatable but axially fixed side valve spindle (25) with an axially adjustable but radially locked locknut (26) screwed thereon and, therebelow, with a spring (41) plugged thereon and with a carrier (42) connected thereto;
    c) the outer thread part of the side valve spindle (25) is situated in the carrier (42) in a telescopically displaceable manner, and the spring (41) is clamped between the locknut (26) and a spring receiving part (421) which is fixed internally in the carrier (42);
    d) the carrier (42) is guided in an axially displaceable manner in the vertical passage (466);
    e) the carrier (42) has a seal (43) at the bottom; and
    f) a sealing surface (16) is provided inside the top part (1) for each of the side valves (SVleft,SVright ) and is closed off by the respective seal (43) in the position effective as backflow preventer (4).
  10. Hydrant according to Claim 9, characterized in that
    a) the housing (46) is of substantially plate-like form;
    b) the respective sealing surface (16) is formed by way of a narrowed internal diameter in the top part (1);
    c) the spring (41) is a helical spring acting as a compression spring;
    d) the side valve spindle (25), whose outer thread part projects into the vertical passage (466), is axially fixed in a cover (427) fastened at the top on the vertical passage (466);
    e) a disc-like seal base (423), on which the seal (43) is seated, is fastened to the free end of the carrier (42); and
    f) the components of the backflow preventer (4) in the respective side valve (SVleft,SVright ) are configured and arranged such that:
    fa) in the position effective as backflow preventer (4), the pressure from irregular medium present at the outlet piece (11) boosts the contact pressure generated from the spring (41) to the seal (43) and the sealing surface (16); and
    fb) in the case of removal of water from the respective outlet piece (11), the seal (43), counter to the action of the spring (41), is lifted off from the sealing surface (16) by way of the flow pressure and, in this way, a free path for the flow of water through the opened sealing surface (16) to the used outlet piece (11) is formed.
EP18405011.0A 2017-05-02 2018-04-27 Hydrant with back flow preventer in the upper part Active EP3399112B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH00584/17A CH713755A1 (en) 2017-05-02 2017-05-02 Hydrant with backflow preventer in the upper part.

Publications (2)

Publication Number Publication Date
EP3399112A1 EP3399112A1 (en) 2018-11-07
EP3399112B1 true EP3399112B1 (en) 2020-10-28

Family

ID=60083719

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18405011.0A Active EP3399112B1 (en) 2017-05-02 2018-04-27 Hydrant with back flow preventer in the upper part

Country Status (2)

Country Link
EP (1) EP3399112B1 (en)
CH (1) CH713755A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112982573B (en) * 2021-03-09 2024-05-24 列斯丽(深圳)技术有限公司 Self-draining fire hydrant structure and fire well comprising same

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH693067A5 (en) * 1998-08-26 2003-02-14 Von Roll Holding Ag Nebenabsperrorgan for hydrants.
EP1010821A1 (en) * 1998-12-19 2000-06-21 Heinz-Jürgen Pfitzner No-return valve for hydrants
US7428910B2 (en) * 2002-12-04 2008-09-30 Davidson Hydrant Technologies, Inc. Breathable fire hydrant rod
US6910495B2 (en) * 2003-02-06 2005-06-28 Anthony P. Lafalce Backflow prevention system
WO2009158706A1 (en) * 2008-06-27 2009-12-30 Davidson Hydrant Technologies, Inc. Weeping system for fire hydrant having a protective valve or device
DE202012001007U1 (en) * 2012-02-01 2012-06-11 Awg Fittings Gmbh Standpipe with non-return valve and venting valve

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
CH713755A1 (en) 2018-11-15
EP3399112A1 (en) 2018-11-07

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