EP1604070A1 - Dispositif destine a empecher le reflux - Google Patents

Dispositif destine a empecher le reflux

Info

Publication number
EP1604070A1
EP1604070A1 EP04717598A EP04717598A EP1604070A1 EP 1604070 A1 EP1604070 A1 EP 1604070A1 EP 04717598 A EP04717598 A EP 04717598A EP 04717598 A EP04717598 A EP 04717598A EP 1604070 A1 EP1604070 A1 EP 1604070A1
Authority
EP
European Patent Office
Prior art keywords
valve body
backflow preventer
valve
closing
preventer according
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.)
Withdrawn
Application number
EP04717598A
Other languages
German (de)
English (en)
Inventor
Robert Nathan
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.)
Alfred Kaercher SE and Co KG
Original Assignee
Alfred Kaercher SE and Co KG
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 Alfred Kaercher SE and Co KG filed Critical Alfred Kaercher SE and Co KG
Publication of EP1604070A1 publication Critical patent/EP1604070A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03C—DOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; SINKS
    • E03C1/00—Domestic plumbing installations for fresh water or waste water; Sinks
    • E03C1/02—Plumbing installations for fresh water
    • E03C1/10—Devices for preventing contamination of drinking-water pipes, e.g. means for aerating self-closing flushing valves
    • E03C1/106—Devices for preventing contamination of drinking-water pipes, e.g. means for aerating self-closing flushing valves using two or more check valves
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03C—DOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; SINKS
    • E03C1/00—Domestic plumbing installations for fresh water or waste water; Sinks
    • E03C1/02—Plumbing installations for fresh water
    • E03C1/10—Devices for preventing contamination of drinking-water pipes, e.g. means for aerating self-closing flushing valves
    • E03C1/108—Devices for preventing contamination of drinking-water pipes, e.g. means for aerating self-closing flushing valves having an aerating valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00—Check valves
    • F16K15/02—Check valves with guided rigid valve members
    • F16K15/06—Check valves with guided rigid valve members with guided stems
    • F16K15/063—Check valves with guided rigid valve members with guided stems the valve being loaded by a spring
    • F16K15/066—Check valves with guided rigid valve members with guided stems the valve being loaded by a spring with a plurality of valve members

Definitions

  • the invention relates to a backflow preventer with a housing having an inlet and an outlet, forming a flow path leading from the inlet to the outlet, with two check valves in the flow path which open in the flow direction and are connected in series, with a discharge channel emerging from the space between the two check valves, with a closing the drainage channel, in the housing of this valve body which can be displaced in a sealed manner, is moved under the action of a spring into an open position which releases the drainage channel and, when the housing is flowed through, against the action of the spring in a closed position and which accommodates the check valve arranged upstream.
  • check valves are known for example from DE 198 54 951 AI, DE 21 57 363 AI, DE 24 24 978 AI or EP 1 022 398 AI.
  • the known constructions serve to reliably prevent, when a consumer is connected to a pressurized supply system, that liquid is pushed back out of the consumer into the supply line when pressure peaks occur in the consumer. If such pressure peaks occur that exceed the pressure in the supply line, one or both check valves close and thus prevent the undesired backflow. Difficulties arise, however, if you want to connect consumers that are equipped with such a non-return valve to a supply system that is not under pressure, for example if you want to operate a consumer in suction mode, i.e. the consumer is liquid, for example from a lake or a Sucks in the reservoir in which the liquid is not under pressure. In this operating mode, the check valves do not open and the backflow preventer prevents operation.
  • a backflow preventer of the type described at the outset which is characterized by a blocking device which fixes both check valves in the open position and the valve body in the closed position.
  • the backflow preventer is equipped with such a blocking device, the backflow preventer is switched to passage and the drainage channel is closed, so that the backflow preventer allows incoming liquid to flow through without loss, but does not show any kickback effect. If the blocking device is activated, a consumer is thus equipped with such a backflow preventer for suction operation, but if the blocking device is deactivated, a conventional backflow preventer with a double non-return effect is obtained.
  • the blocking device comprises separate means to open each of the check valves and to hold them in the open position and also to move the valve body into the closed position and to hold it there.
  • the check valve in the valve body moves the other check valve into the open position via an actuating element when it is moved into the open position and when the valve body is moved into the closed position. It is then sufficient to move the one check valve into the open position and hold it in this position, and at the same time one obtains a permanent shift into the open position with the second check valve.
  • this can be achieved in that the closing bodies of the two check valves can be displaced axially parallel to one another, in particular coaxially to one another, and that the actuating element is an extension which establishes a non-positive connection between the closing bodies as soon as the valve body is in the closed position and the shooting body in the check valve the valve body is moved to the open position, while such a positive connection is independent
  • the dimensions can also be chosen so that even when the valve body is in the closed position, the positive connection between the closing bodies is only established when the closing body in the valve body has not only been lifted from its valve seat, but over a certain distance from it Valve seat is removed. This can ensure that in normal printing operation the downstream check valve can also reach the firing position when the valve body is in the closed position and the check valve arranged therein in the open position.
  • the closing body in the valve body must be displaced over a distance that is greater than its normal opening movement in order to additionally also move the closing body of the downstream check valve into the open position.
  • the extension can be a push rod, which is preferably part of the closing body in the valve body.
  • the actuating device comprises a thrust element which can be placed in the direction of displacement on the closing body of the check valve in the valve body and can be displaced in the direction of displacement of the closing valve.
  • This can be a push rod which is sealed through the wall of the housing.
  • the thrust element can be inserted into the housing through the feed.
  • the thrust element can be a piece of pipe.
  • this piece of pipe is a connecting piece to the feed, which is connected to a supply line. So when this special piece of pipe is inserted into the feed, it automatically moves the valve body in the closed position and the closing body of the check valves in the open position.
  • the supply line can be a special suction line and can have a suction head at its end opposite the connecting piece, by means of which a connection to a supply system under pressure is excluded.
  • the closing body in the valve body can have a stop limiting its opening movement with respect to the valve body, so that when the thrust element is advanced over a distance which is greater than the normal opening stroke of the closing body in the valve body, the closing body moves the valve body into its closed position.
  • the thrust element first contacts the closing body of the check valve arranged in the valve body and only after its displacement in the open position also on the valve body, so that the valve body is also displaced directly by the thrust element and not indirectly via the closing body as in the case of Design described above.
  • the closing body can carry a protrusion projecting over the valve body, on which the thrust element comes into contact, so that the closing body is first displaced and only then the valve body.
  • Figure 1 is a longitudinal sectional view of a check valve with two check valves in the rest position
  • Figure 2 is a view of the backflow preventer of Figure 1 when connected to a conventional pressure supply system before opening the check valves and
  • Figure 3 a view of the backflow preventer of Figures 1 and 2 with an inserted connecting piece for permanent opening of the check valves and for permanent closing of the drainage channel.
  • the backflow preventer 1 shown in the drawing is connected to the supply input of a consumer device, for example a high-pressure cleaning device or another device to which liquid is supplied from a supply line.
  • a consumer device for example a high-pressure cleaning device or another device to which liquid is supplied from a supply line.
  • the backflow preventer shown in the drawing has a housing 2, which is composed of two housing parts 3, 4.
  • the first housing part comprises an inflow pipe socket 5, which opens bell-shaped into a cylindrical valve chamber 6, which is open at its end opposite the inflow pipe socket 5 and is closed there by a second housing part 4 in the form of a cover or base.
  • This cover or bottom-shaped housing part 4 is followed by a drain pipe socket 7, which is angled in the exemplary embodiment shown, but which could also be designed in a straight line.
  • the cover-shaped housing part 4 has a central opening 8, which widens conically towards the drain pipe socket and thus forms a valve seat 9 for a closing body 10, which is displaceably mounted in a guide 11 of the drain pipe socket 7 in the longitudinal direction of the housing part 3 and is shifted by means of a compression spring 13 surrounding a shaft 12 of the closing body 10 into a closed position in which the closing body 10 bears against the valve seat 9 by means of an annular seal 15 inserted in a circumferential groove 14 and closes the opening 8. against the action of the compression spring 13, the closing body 10 can be lifted off the valve seat 9 and thereby open the opening 8.
  • the closing body 10 forms, together with the valve seat 9, a check valve which opens counter to the flow direction of the check valve 1.
  • a drain channel 16 which connects the interior of the housing part 3 with the surroundings and, as in the exemplary embodiment shown, can be designed as a simple opening in the wall of the housing part 3.
  • a valve body 17 is mounted so as to be displaceable in the longitudinal direction. This is sealed against the inner wall of the valve chamber 6 via an annular seal 19 inserted into a circumferential groove 18.
  • annular seal 19 inserted into a circumferential groove 18.
  • a further ring seal 21 is inserted into a circumferential groove 20 of the valve body 17, which sealingly immerses in an annular groove 22 on the surface of the cover-shaped housing part 4 on the valve chamber side when the valve body 17 is displaced against the cover-shaped housing part 4.
  • the annular groove 22 thus forms a valve seat for the valve body 17.
  • the valve body 17 releases the drain channel 16 in its open position removed from the cover-shaped housing part 4; in its opposite position, in which the ring seal 21 engages in the circumferential groove 20, on the other hand, it closes the drain channel 16 on the one hand by engaging the ring seal 21 on the circumferential groove 20 and on the other hand by the sealing effect of the ring seal 19 against the inner wall of the valve chamber 6.
  • the valve body 17 is sleeve-shaped and has a sealing region 23 which widens conically from the inflow side and an adjoining circular cylindrical section 24.
  • a closing body 30 is slidably mounted in the longitudinal direction, which is constructed essentially the same as the closing body 19, in a disc-shaped head part 25, an annular seal 27 is inserted in a circumferential groove 26, a central one closes to the head part 25 Extension-forming shaft 28, and this shaft is surrounded by a compression spring 29, which is supported on the one hand on the bottom-shaped housing part 4 and on the other hand on the plate-shaped head part 25 and thereby presses the closing body 30 sealingly against the sealing area 23, the seal being thereby through the system the ring seal 27 at the sealing area 23 caused.
  • the closing body 30 and the sealing area 23 form a second check valve.
  • the compression spring 29 not only has the effect that the closing body 30 is moved into the closed position in sealing contact with the sealing area 23, but also through the compression spring 29 the valve body 17 is moved into its open position via the closing body 30 resting on the sealing area 23, this open position is shown in Figure 1.
  • the shaft 28 is so long that its end 31 opposite the plate-shaped head part 25 comes into contact with the closing body 10 when the valve body 17 is in the closed position and when the closing body 30 is moved into the open position.
  • a recess 32 is provided in the closing body 30, into which the tapered end 31 of the shaft 28 can engage.
  • a few projections 33 are arranged centrally in the direction of the inflow pipe socket 5, which protrude slightly over the inflow-side edge of the valve body 17 when the closing body 30 is closed.
  • the consumer In normal operation, the consumer is connected to a supply line by means of the backflow preventer, in which liquid with excess pressure is made available. Then the backflow preventer 1 works like a known backflow preventer.
  • the valve body 17 and the two Before the opening of the supply line system, the valve body 17 and the two are in the open position Check valves in the closed position. This position is shown in Figure 1. As soon as the supply line is opened, the pressure of the inflowing liquid shifts the valve body into the closed position, this position is shown in FIG. 2. Furthermore, the liquid then opens the two check valves and the liquid can be supplied to the consumer. If pressure peaks occur in the consumer that would cause the liquid to flow back, the check valves close and prevent such a backflow.
  • a special connecting piece 34 is inserted into the inflow pipe socket 5, as shown in FIG.
  • the connecting piece 34 comprises on one side a pipe section 35 which engages in the inflow pipe socket 5, and on the other side, for example, a pipe nipple 36 onto which a suction hose can be pushed.
  • the insertion depth can be limited by a circumferential collar 37, in addition, the pipe section 35 is provided on its outflow side with transverse webs 38, which do not significantly impede the passage of the liquid, but which abut the projections 33 of the closing body 30 when the pipe section 35 is inserted. This system takes place before the pipe section 35 is fully inserted.

Landscapes

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

Abstract

Dispositif (1) destiné à empêcher le reflux qui possède un boîtier (2) pourvu d'un orifice d'entrée et d'un orifice de sortie et formant un passage d'écoulement raccordant l'orifice d'entrée à l'orifice de sortie, deux soupapes de non-retour (9, 10, 23, 30) s'ouvrant dans le sens d'écoulement et montées l'une derrière l'autre dans le passage d'écoulement, un canal de sortie (16) sortant de l'espace intermédiaire situé entre les deux soupapes de non-retour et un corps (17) de soupape fermant le canal de sortie (16) dans le boîtier (2) et coulissant dans le boîtier de manière étanche par rapport à ce dernier. Le corps de soupape est déplacé sous l'action d'un ressort (29) dans une position d'ouverture libérant le canal de sortie et contre l'action du ressort dans une position de fermeture, lorsque le boîtier est traversé par le fluide en écoulement, la soupape de non-retour placée en amont par rapport au sens d'écoulement étant reçue dans ledit corps de soupape. Selon la présente invention, pour permettre à un appareil pourvu d'un dispositif destiné à empêcher le reflux de ce type de fonctionner en mode d'aspiration, ledit dispositif comporte un dispositif de blocage (34) qui maintient les deux soupapes de non-retour (9, 10, 23, 30) dans la position d'ouverture et le corps de soupape (17) dans la position de fermeture.
EP04717598A 2003-03-14 2004-03-05 Dispositif destine a empecher le reflux Withdrawn EP1604070A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10311251 2003-03-14
DE2003111251 DE10311251B3 (de) 2003-03-14 2003-03-14 Rückflussverhinderer
PCT/EP2004/002235 WO2004081302A1 (fr) 2003-03-14 2004-03-05 Dispositif destine a empecher le reflux

Publications (1)

Publication Number Publication Date
EP1604070A1 true EP1604070A1 (fr) 2005-12-14

Family

ID=32980591

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04717598A Withdrawn EP1604070A1 (fr) 2003-03-14 2004-03-05 Dispositif destine a empecher le reflux

Country Status (5)

Country Link
EP (1) EP1604070A1 (fr)
CN (1) CN1761793A (fr)
AU (1) AU2004219972A1 (fr)
DE (1) DE10311251B3 (fr)
WO (1) WO2004081302A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005062517B3 (de) * 2005-12-15 2007-05-31 Alfred Kärcher Gmbh & Co. Kg Rückflussverhinderer
FR3034835B1 (fr) * 2015-04-13 2017-11-10 Guerry Innovation Dispositif anti-retour pour une canalisation de transport d'un fluide
FR3069811B1 (fr) * 2017-08-02 2019-08-02 Sogefi Filtration Dispositif de regulation de pression et son procede d'assemblage, pour un absorbeur de vapeurs de carburant
GB2579363B (en) * 2018-11-28 2023-03-29 Mercantile Ventures Ltd Double check valve arrangement
CN114352781B (zh) * 2022-03-17 2022-06-24 中车太原机车车辆有限公司 一种铁路货车用给风调整阀

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2157363A1 (de) * 1971-11-19 1973-05-24 Guenter Preuss Rohrunterbrecher fuer fluessigkeitsleitungen
DE2424978C2 (de) * 1974-05-22 1985-01-10 Honeywell-Braukmann GmbH, 6950 Mosbach Rohrunterbrecher, insbesondere für Hauswasserleitungen
FR2620785B1 (fr) * 1987-09-22 1990-01-12 Haudiquer Sa Organe de controle de l'ecoulement d'un fluide constituant au moins un clapet anti-retour
DE4142866C2 (de) * 1991-12-23 1994-03-03 Gruenbeck Josef Wasseraufb Rohrtrenner
DE4231494C1 (de) * 1992-09-21 1994-02-10 Baelz Juergen Controls Rückflußverhinderungseinrichtung für Trinkwasserleitungen
US6050295A (en) * 1998-06-04 2000-04-18 Fastest, Inc. High flow valved fitting
DE19854951C2 (de) * 1998-11-27 2001-11-15 Rudolf Vollmer Systemtrenner
DE19902574C1 (de) * 1999-01-22 2000-10-05 Rudolf Vollmer Systemtrenner
DE10103374A1 (de) * 2001-01-26 2002-08-01 Sasserath & Co Kg H Rohrtrenner

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004081302A1 *

Also Published As

Publication number Publication date
CN1761793A (zh) 2006-04-19
DE10311251B3 (de) 2005-01-05
WO2004081302A1 (fr) 2004-09-23
AU2004219972A1 (en) 2004-09-23

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