EP0463702B1 - Hydrant mit Rückschlagventil - Google Patents

Hydrant mit Rückschlagventil Download PDF

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Publication number
EP0463702B1
EP0463702B1 EP19910201621 EP91201621A EP0463702B1 EP 0463702 B1 EP0463702 B1 EP 0463702B1 EP 19910201621 EP19910201621 EP 19910201621 EP 91201621 A EP91201621 A EP 91201621A EP 0463702 B1 EP0463702 B1 EP 0463702B1
Authority
EP
European Patent Office
Prior art keywords
valve
fire hydrant
standpipe
passage
check valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19910201621
Other languages
English (en)
French (fr)
Other versions
EP0463702A1 (de
Inventor
Henricus Matheus Cornelia Van Diessen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RMI HOLLAND BV
Original Assignee
RMI HOLLAND BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by RMI HOLLAND BV filed Critical RMI HOLLAND BV
Publication of EP0463702A1 publication Critical patent/EP0463702A1/de
Application granted granted Critical
Publication of EP0463702B1 publication Critical patent/EP0463702B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
    • E03B9/00—Methods or installations for drawing-off water
    • E03B9/02—Hydrants; Arrangements of valves therein; Keys for hydrants
    • E03B9/16—Devices for retaining foreign matter, e.g. sand
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
    • E03B9/00—Methods or installations for drawing-off water
    • E03B9/02—Hydrants; Arrangements of valves therein; Keys for hydrants

Definitions

  • the invention relates to a fire hydrant comprising a standpipe with closable top outlet and with an underside in communication with a pressure pipe for water or the like, a valve seat arranged in the standpipe and at the underside thereof, a main valve, a valve stem carried upward through the stand pipe and control means arranged above the standpipe for moving the valve stem up or down in order to release the main valve and to respectively lift from and press it against the seat, and a freely movable check valve arranged and guided in the passage of the standpipe between valve seat and pressure pipe.
  • Fire hydrants of the type described in the preamble and disclosed in EP-A-0 113 913 are typically arranged in the ground and connect to an underground pipe system.
  • the danger that occurs here is that dirt collects in the standpipe if the fire hydrant is not used.
  • liquid from the pressure pipe system will first be pressed upward into the standpipe and compress the air in the standpipe. After the flow in the water has stopped, the dirt carried upward will sink downward and can enter the mains network via the open valve and thus pollute the water, which involves a danger to public health if this water is used as drinking water.
  • the invention has for its object to ameliorate the working of the check valve and provides to this end a fire hydrant which is distinguished in that the check valve is provided with an upper surface, being parallel to the pressure surface of the bottom of the main valve, said lower surface of the main valve and the top surface of the check valve are embodied with co-acting complementary centering means, for example an annular groove having annular ribs fitting therein and wherein the check valve body is provided with one or more guiding members, like pins protruding into the passage.
  • the main valve is covered with a jacket of elastic material.
  • the main valve can be guided in ridges or cams arranged in the standpipe in order to keep the guiding of the main valve purely axial, which contributes to better guiding of the check valve and thereby to preventing the resonance phenomenon with the "loose" check valve.
  • the standpipe which is provided at its top end with a closable passageway 2.
  • a coupling 3 is arranged on the passageway 2 for connecting a counter coupling which is attached to a hose or the like.
  • the passageway 2 is closed off by means of a cover 4.
  • the standpipe 1 is provided on the underside with a passage 5 and a connecting flange 6 which can be fixed by means of bolts 7 onto a flange 8 of a pressure pipe (not shown) of a mains network.
  • Extending on the top of the passage 5 is an annular horizontal head end surface 9 which serves as seat for a main valve 10 to be pressed thereon.
  • the main valve 10 is coupled via a control rod or valve stem 11 to a control mechanism arranged outside the standpipe 1 at the top side adjacent to the passageway 2.
  • the control mechanism has a support 12 wherein a threaded rod 13 is rotatably mounted at 14.
  • the threaded rod 13 is provided at the top end with a coupling pin 15, whereon a bush 16 with square head can be mounted with clamping fit.
  • the threaded rod 13 co-acts with a nut 17 which is received non-rotatably in the top end of the valve stem 11.
  • the valve stem is provided at the top end 18 with an axial blind bore for receiving the bottom end of the threaded rod 13.
  • the per se known operating method of the valve stem 11 provides for lifting of the valve 10 from and the pressing thereof onto the seat 9 by setting the threaded rod 13 into rotation with a suitable hand tool. This rotation ensures an up and downward movement of the nut 17 and therefore of the valve stem 11 with the main valve 10 coupled thereto.
  • the standpipe 1 can be filled with water from the mains network on the underside of the flange 8 by lifting the valve 10, and otherwise closed off therefrom by replacing the valve 10 on the seat 9. Any water present in the standpipe 1 can be discharged via a dewatering opening 19, so that no danger of freezing can occur. It is noted that when the valve 10 is lifted the dewatering opening 19 is enclosed by the side thereof, see fig. 3, 4, so that when the fire hydrant is used there are no losses due to leakage.
  • check valve 20 Arranged according to the invention under the main valve 10 is a check valve 20 which is embodied here as a disc-shaped body with three of four guide pins 21 along the periphery on the bottom surface thereof. These guide pins lie flat against the inner wall of the passage 5.
  • the peripheral edge of the disc-shaped check valve 20 widens towards the top, in other words, is slightly conical and connects to an annular, upwardly widening surface of the passage 5, which surface connects to the head end surface 9 which serves as seat for the main valve 10.
  • Recessed into the peripheral surface 22 of the check valve 20 is a groove wherein an O-ring 23 is received. This O-ring rests in the position according to fig. 1 against the annular surface of the passage 5.
  • the main valve 10 consists of a core of rigid material that is covered with a jacket of elastic material 25. It is noted that the core of the main valve is embodied on the underside with an outwardly protruding radial flange 26 which protrudes over the seat 9.
  • the core initially extends in a cylindrical part which extends upward over a determined height such that in co-action with the adjacent jacket 25 the opening of the discharge channel 19 debouching into the standpipe 1 is closed off if the valve lies in the position according to fig. 3, 4.
  • the core extends further in a frusto-conical portion wherein a blind bore 27 is received.
  • the blind bore had at a determined height above the bottom thereof an annular channel 28 that serves to receive an annular ring 29.
  • the valve stem 11 is provided on the underside with a narrowed portion 30 likewise provided with an annular channel 31 wherein the annular ring 29 fits.
  • the bottom end of the narrowed portion 30 is rounded off and can press on the bottom of the blind bore 27 when the valve stem is mounted in the valve 10 as shown in fig. 1.
  • the covering of elastic material 25 can be provided on the shoulder between the transition of the valve stem to the narrowed portion 30 with an integrally moulded O-ring 32 in order to seal the blind bore 27 against the water standing in the standpipe 1.
  • this O-ring 32 also functions to orient the valve body 10 axially relative to the centre line of the valve stem 11.
  • ridges 33 are cast on the inside of the standpipe 1, the contact surface of these ridges with the valve 10 being machined.
  • the ridges 33 are arranged as shown in a widened part of the standpipe 1, necessary to realize sufficient passage for the water to be carried through.
  • the bottom surface of the valve 10, in particular the covering 25, has an annular ridge 35, which co-acts with an annular groove 36 recessed in the upper surface of the check valve 20.
  • Said ridge and groove act like centering means in order to retain the free-movable check valve in the center of the main valve.
  • Other embodiments are possible.
  • the user can raise the main valve 10 by turning the threaded rod 13 in the correct direction, whereby the valve stem 11 is moved upward taking with it the valve 10. If there is pressure in the mains network on the underside of the check valve 20, this valve is immediately moved upward and, if there is sufficient pressure, will remain lying against the main valve 10.
  • the water flow is such that all the dirt which could possibly have collected in the standpipe 1 can be carried along with the water flow via the outlet opening 2 of the standpipe 1. This position is shown in fig. 4.
  • the fire hydrant can be closed again by carrying the valve stem 11 downward by turning the threaded rod 13 in opposing direction, whereby the main valve 10 is pressed with its bottom surface onto the top surface of the check valve 20 until the edge of the main valve rests on the seat 9.
  • the guiding of the main valve 10 is ensured because of the ridges 33 so that the bottom surface remains precisely parallel to the top surface of the check valve 20.
  • valve stem 11 Owing to the universal joint between valve stem 11 and valve body 10 a setting of the valve on the seat is possible without problem. It is further noted here that the pressure force of the valve stem 11 can be transmitted directly onto the valve body 10 by the contact between the bottom end of the valve stem and the bottom of the blind bore in the valve.
  • Fig. 5 shows an alternative embodiment of the valve guiding for the check valve 20.
  • the valve body thereof is embodied for this purpose with a central pin 40 which is received in a bush 41 which is connected to the wall of the passage 5 via radially directed arms 42.
  • the pin 40 can therefore ensure an upright guiding of the check valve 20 in accordance with the pins 21 of the foregoing embodiment.

Landscapes

  • 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)
  • Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
  • Lift Valve (AREA)
  • Details Of Valves (AREA)

Claims (10)

  1. Feuerhydrant mit einem Standrohr (1) mit verschließbarem oberen Auslaß (2) und einer Unterseite, die in Verbindung mit einer Druckleitung für Wasser od.dgl. steht, einem in dem Standrohr (1) und an dessen Unterseite angeordneten Ventilsitz (9), einem Hauptventil (10), einem nach oben durch das Standrohr geführten Ventilschaft (11), und oberhalb des Standrohres vorgesehenen Bedienungsmitteln (16) zum Auf- und Abbewegen des Ventilschaftes, um das Hauptventil freizugeben und es vom Sitz abzuheben bzw. gegen ihn anzupressen, sowie einem freibeweglichen Rückschlagventil (20), das in dem Durchlaß des Standrohres zwischen dem Ventilsitz (9) und der Druckleitung angeordnet und geführt ist, dadurch gekennzeichnet, daß das Rückschlagventil eine obere Fläche parallel zu der Druckfläche an der Unterseite des Hauptventils (10) aufweist, daß an der unteren Fläche des Hauptventils (10) und an der oberen Fläche des Rückschlagventils (20) zusammenwirkende, komplementäre Zentriermittel (35,36) ausgebildet sind, z.B. eine Ringnut mit in diese passenden Ringrippen, und daß der Rückschlagventilkörper mit einem oder mehreren Führungselementen, wie in den Durchlaß (5) vorspringenden Stiften, versehen ist.
  2. Feuerhydrant nach Anspruch 1, dadurch gekennzeichnet, daß mindestens drei Führungsstifte (21) vorgesehen sind, die in einem Abstand von der Innenwand des Durchlasses verlaufen.
  3. Feuerhydrant nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß an dem scheibenförmigen oberen Teil des Rückschlagventils (20) eine Umfangskante (22) ausgebildet ist, die sich nach oben erweitert und mit einer komplementären Ringfläche (23) in dem Durchlaß (5) zusammenwirkt.
  4. Feuerhydrant nach Anspruch 3, dadurch gekennzeichnet, daß in der Umfangskante des Rückschlagventils eine Nut zur Aufnahme eines O-Rings ausgenommen ist.
  5. Feuerhydrant nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die Wand des Durchlasses direkt in eine obere Stirnfläche (9) des Durchlasses (5) übergeht, die als Ventilsitz ausgebildet ist.
  6. Feuerhydrant nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß das Hauptventil (10) mit einem Mantel (25) aus elastischem Material bedeckt ist.
  7. Feuerhydrant nach Anspruch 6, dadurch gekennzeichnet, daß der Mantel (25) am Übergang zwischen dem Ventilschaft und dem Ventilkörper mit einem einstückig daran angeformten O-Ring (28) versehen ist.
  8. Feuerhydrant nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß das Hauptventil mit dem Ventilschaft (11) durch ein Universalgelenk (30) verbunden ist.
  9. Feuerhydrant nach Anspruch 8, dadurch gekennzeichnet, daß das Universalgelenk gebildet ist durch einen Ring (28), der mit Spiel in einer Nut des Ventilschaftes (11) aufgenommen ist, und einer gegenüberliegenden Nut in einer Sackbohrung (27) des Ventilkörpers (10).
  10. Feuerhydrant nach Anspruch 8 oder 9, dadurch gekennzeichnet, daß der Ventilkörper (10) zwischen drei oder mehr nach innen vorspringenden Rippen (33) in dem Standrohr (1) gehalten ist.
EP19910201621 1990-06-22 1991-06-24 Hydrant mit Rückschlagventil Expired - Lifetime EP0463702B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL9001434A NL9001434A (nl) 1990-06-22 1990-06-22 Brandkraan met terugslagklep.
NL9001434 1990-06-22

Publications (2)

Publication Number Publication Date
EP0463702A1 EP0463702A1 (de) 1992-01-02
EP0463702B1 true EP0463702B1 (de) 1994-09-28

Family

ID=19857299

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910201621 Expired - Lifetime EP0463702B1 (de) 1990-06-22 1991-06-24 Hydrant mit Rückschlagventil

Country Status (3)

Country Link
EP (1) EP0463702B1 (de)
DE (1) DE69104275T2 (de)
NL (1) NL9001434A (de)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7240688B2 (en) 2002-12-04 2007-07-10 Davidson Hydrant Technologies, Inc. Retrofitting a fire hydrant with secondary valve
US7428910B2 (en) 2002-12-04 2008-09-30 Davidson Hydrant Technologies, Inc. Breathable fire hydrant rod
US6868860B2 (en) 2002-12-04 2005-03-22 Davidson Hydrant Technologies, Inc. Fire hydrant with second valve
US7775231B2 (en) 2002-12-04 2010-08-17 Davidson Hydrant Technologies, Inc. Retrofitting a fire hydrant with a replacement hydrant body containing a secondary valve
GB2418461A (en) 2004-09-01 2006-03-29 Darryll Arthur Douglas Holland Vented port-cap for fire hydrant
US7575017B2 (en) 2006-10-06 2009-08-18 Davidson Hydrant Technologies, Inc. Wet barrel fire hydrant system with second valve
DE102008014423B4 (de) 2008-03-14 2011-03-17 Avk Mittelmann Armaturen Gmbh Hydrant
CH700378B1 (de) * 2009-02-11 2012-09-28 E Hawle Armaturenwerke Gmbh Ventil an einem Hydranten.
CN102587456A (zh) * 2012-03-26 2012-07-18 华东交通大学 两级调压多功能型室外消火栓
RS62309B1 (sr) * 2017-10-16 2021-09-30 Vonroll Infratec Invest Ag Zatvarajući element za primenu u hidrantu, hidrant i sedište glavnog ventila

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE468926C (de) * 1928-11-26 Joseph Menge Mit einem Abschluss- und Rueckschlagventil ausgeruestete Abtrittspuelvorrichtung mit Windkessel
US2515770A (en) * 1947-05-17 1950-07-18 Gronberg John Henric Paulus Fire hydrant
US3035609A (en) * 1958-01-02 1962-05-22 Phillips Petroleum Co Fluid handling structure
US3043329A (en) * 1959-04-24 1962-07-10 Wendell Coffee Irrigation valve
FR2237016A1 (en) * 1973-07-09 1975-02-07 Pont A Mousson Automatic water sprinkler unit - is for horticultural purposes having a non return valve to catch debris
US4489746A (en) * 1982-05-28 1984-12-25 Mueller Co. Backflow preventer apparatus
DE3247955C1 (de) * 1982-12-24 1984-02-09 Bopp & Reuther Gmbh, 6800 Mannheim Unter- oder UEberflurhydrant
DE3435778C2 (de) * 1984-09-28 1996-03-21 Mittelmann Armaturen Hydrant, insbesondere Unterflurhydrant

Also Published As

Publication number Publication date
NL9001434A (nl) 1992-01-16
DE69104275T2 (de) 1995-02-16
DE69104275D1 (de) 1994-11-03
EP0463702A1 (de) 1992-01-02

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