EP0339104B1 - Plumbing device - Google Patents

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Publication number
EP0339104B1
EP0339104B1 EP88106643A EP88106643A EP0339104B1 EP 0339104 B1 EP0339104 B1 EP 0339104B1 EP 88106643 A EP88106643 A EP 88106643A EP 88106643 A EP88106643 A EP 88106643A EP 0339104 B1 EP0339104 B1 EP 0339104B1
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EP
European Patent Office
Prior art keywords
valve
housing
check valves
diaphragm
outlet
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
EP88106643A
Other languages
German (de)
French (fr)
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EP0339104A1 (en
Inventor
Rudolf Dipl.-Ing. Vollmer (Fh)
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.)
Honeywell Braukmann GmbH
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Honeywell Braukmann GmbH
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.)
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Publication date
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Application filed by Honeywell Braukmann GmbH filed Critical Honeywell Braukmann GmbH
Priority to AT88106643T priority Critical patent/ATE66989T1/en
Priority to EP88106643A priority patent/EP0339104B1/en
Priority to DE8888106643T priority patent/DE3864681D1/en
Priority to US07/339,280 priority patent/US4895180A/en
Publication of EP0339104A1 publication Critical patent/EP0339104A1/en
Application granted granted Critical
Publication of EP0339104B1 publication Critical patent/EP0339104B1/en
Anticipated expiration legal-status Critical
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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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/2496—Self-proportioning or correlating systems
    • Y10T137/2559—Self-controlled branched flow systems
    • Y10T137/2574—Bypass or relief controlled by main line fluid condition
    • Y10T137/2579—Flow rate responsive
    • Y10T137/2587—Bypass or relief valve biased open
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/2496—Self-proportioning or correlating systems
    • Y10T137/2559—Self-controlled branched flow systems
    • Y10T137/2574—Bypass or relief controlled by main line fluid condition
    • Y10T137/2579—Flow rate responsive
    • Y10T137/2594—Choke
    • Y10T137/2597—Variable choke resistance
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/3149—Back flow prevention by vacuum breaking [e.g., anti-siphon devices]
    • Y10T137/3185—Air vent in liquid flow line
    • Y10T137/3294—Valved
    • Y10T137/3331—With co-acting valve in liquid flow path

Definitions

  • the present invention relates to a fitting for preventing the backflow of water in a supply line according to the preamble of claim 1.
  • Such fittings generally include two check valves in series with a vent valve in between.
  • a fitting is known, for example, from US-A-4 207 015.
  • This known valve works as a backflow preventer and comprises a vertical and parallel arrangement of all valves, so that when a cover is removed, these valves can easily be replaced or serviced without the entire valve having to be removed from the supply line.
  • the check valves have a similar construction, and different mounting devices are provided for each check valve, so that the risk of incorrect use of the check valves in the valve is eliminated.
  • the vent valve is arranged laterally from the plane in which the two check valves are located, which results in a solid fitting with an asymmetrical construction.
  • FR-A-2 544 832 shows a check valve in which the two check valves are arranged in the inlet and outlet. In order to be able to replace them, the chamber vented by the vent valve must be of relatively large volume.
  • the fitting has a cross-shaped housing 10 with a water inlet connector 12 and a water outlet connector 14 which are aligned with one another.
  • these connecting pieces 12, 14 can be connected to an incoming and outgoing water pipe 18.
  • Shut-off valves are not shown, which are arranged in front of and behind the fitting in the water line 18 and which are closed when maintenance work, e.g. the valves on the valve must be replaced.
  • the housing 10 merges into a cuboid housing part 20 above the inlet and outlet ports 12 and 14, in order then to assume a cup-shaped shape 22 at the top.
  • a central bore 24 is made from above in the cuboid housing part 20 and two further bores 26 and 28 are made on both sides of this central bore 24.
  • the bores 24 - 28 are all offset in diameter in order to be able to arrange a valve tappet 30 and a return spring 32 surrounding it in the central bore 24 and to arrange check valves 34 and 36 in the other two bores 26 and 28.
  • the return spring 32 is supported on the shoulder 38 formed in the bore 24 and the check valves 34 and 36 are also supported with valve seat bodies 40 and 42 on bore paragraphs 44 and 46. Both valve seat bodies 40 and 42 are held in their illustrated position by spring rings 52 and 54 engaging in grooves 48 and 50. Closing bodies 60 and 62, which are prestressed by springs 56 and 58 of different strengths, are supported on corresponding valve seats on the valve seat bodies 40 and 42.
  • the valve lifter 30 is connected via a diaphragm plate 64 to a diaphragm 66, which is clamped between a flange collar 68 of the cup-shaped housing part 22 and a cover 70.
  • the connection between cover and housing is done by screws, not shown.
  • the valve lifter 30 extends through the membrane 66 and through a further membrane 72 with a smaller diameter, which also extends in a central recess 74 in the cover 70 inside collar flange 76 is inserted.
  • the effective membrane diameter of the membrane 72 corresponds to the valve seat diameter of the valve seat 116.
  • the recess 74 has an internal thread 78 into which a threaded hood 80 is screwed in order to clamp the membrane 72 between itself and the flange collar 76.
  • a spacer sleeve 82 and a thrust washer 84 provide a constant distance between the two membranes 66 and 72 and a nut 86 screwed onto the end of the valve lifter 30 braces the entire arrangement.
  • the threaded hood 80 is provided with a breathing opening 88.
  • the space 94 between the two membranes 66 and 72 is connected to the water inlet connection 12 via a channel 90. Furthermore, a test connection 92 is provided in the cover 70, at which the inlet pressure can be measured. In the same way, a channel 96 connects the water outlet connection 14 to a test connection 98 in the cover 70, at which the outlet pressure can be measured. Another test connection, not shown, in the cover 70 allows the measurement of the pressure in a space 100 between the rear of the check valve 34 and the front of the check valve 36. This space 100 is above recesses 102, 102 '(see FIG. 2) with an output intermediate chamber 104 connected, which is delimited by two partitions 106, 108 and a relief valve 110.
  • the relief valve 110 is seated in a drain port 112 which extends downward concentrically to the valve lifter 30.
  • a drain port 112 In the drain port 112 is a Screwed in valve seat body 114, whose valve seat 116 interacts with a closing body 118 arranged at the lower end of the valve lifter 30.
  • a drain funnel 120 is screwed onto the drain port 112.
  • both check valves 34 and 36 are closed and the vent valve 110 is opened, so that a backflow from the exit to the inlet is not possible and the intermediate chamber 100, 104 through the vent valve 110 is vented or drained.

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)
  • Safety Valves (AREA)
  • Reciprocating Pumps (AREA)
  • Self-Closing Valves And Venting Or Aerating Valves (AREA)
  • Fluid-Driven Valves (AREA)
  • Control Of Fluid Pressure (AREA)
  • Pipe Accessories (AREA)

Abstract

A plumbing device for preventing water from flowing back into a supply pipe possesses a cross-shaped housing (10) constructed symmetrically with respect to the median axis. A diaphragm (66), which is pressurised by the inlet pressure, is clamped between the housing (10) and a cover (70) and acts on a relief valve (110) via a valve plunger (30). Two nonreturn valves (34, 36), which can be easily exchanged when the cover (70) is removed, are arranged parallel to the valve plunger (30), and on both sides thereof, in two bores (26, 28) of the housing (10). <IMAGE>

Description

Die vorliegende Erfindung bezieht sich auf eine Armatur zur Verhinderung des Rückfließens von Wasser in einer Versorgungsleitung nach dem Gattungsbegriff des Patentanspruches 1.The present invention relates to a fitting for preventing the backflow of water in a supply line according to the preamble of claim 1.

Derartige Armaturen umfassen im allgemeinen zwei Rückschlagventile in Reihe mit einem Entlüftungsventil dazwischen. Eine solche Armatur ist z.B. aus US-A-4 207 015 bekannt. Diese bekannte Armatur arbeitet als Rückflußverhinderer und umfaßt eine vertikale und parallele Anordnung aller Ventile, so daß bei einer Entfernung eines Deckels diese Ventile leicht ersetzt bzw. einer Wartung unterzogen werden können, ohne daß die gesamte Armatur aus der Versorgungsleitung herausgetrennt werden muß. Die Rückschlagventile weisen eine einander ähnliche Konstruktion auf, und es sind unterschiedliche Montagevorrichtungen für jedes Rückschlagventil vorgesehen, so daß die Gefahr eines falschen Einsatzes der Rückschlagventile in die Armatur ausgeschlossen ist. Bei dem bekannten Rückflußverhinderer ist das Entlüftungsventil seitlich von der Ebene angeordnet, in der sich die beiden Rückschlagventile befinden, was in einer massiven Armatur mit unsymmetrischer Konstruktion resultiert.Such fittings generally include two check valves in series with a vent valve in between. Such a fitting is known, for example, from US-A-4 207 015. This known valve works as a backflow preventer and comprises a vertical and parallel arrangement of all valves, so that when a cover is removed, these valves can easily be replaced or serviced without the entire valve having to be removed from the supply line. The check valves have a similar construction, and different mounting devices are provided for each check valve, so that the risk of incorrect use of the check valves in the valve is eliminated. In the known backflow preventer, the vent valve is arranged laterally from the plane in which the two check valves are located, which results in a solid fitting with an asymmetrical construction.

Ferner zeigt die FR-A-2 544 832 einen Rückflußverhinderer, bei dem die beiden Rückschlagventile im Einlaß bzw. Auslaß angeordnet sind. Um sie auswechseln zu können, muß die von dem Entlüftungsventil entlüftete Kammer relativ großvolumig sein.Furthermore, FR-A-2 544 832 shows a check valve in which the two check valves are arranged in the inlet and outlet. In order to be able to replace them, the chamber vented by the vent valve must be of relatively large volume.

Es ist daher die Aufgabe der vorliegenden Erfindung, eine Armatur der eingangs genannten Art so auszubilden, daß sie einen äußerst kompakten Aufbau aufweist und leicht in eine Versorgungsleitung eingebaut werden kann. Die Lösung dieser Aufgabe gelingt gemäß den kennzeichnenden Merkmalen des Patentanspruches 1. Weitere vorteilhafte Ausgestaltungen der erfindungsgemäßen Armatur sind den Unteransprüchen entnehmbar.It is therefore the object of the present invention to design a fitting of the type mentioned in such a way that it has an extremely compact structure and can be easily installed in a supply line. This task is solved According to the characterizing features of claim 1. Further advantageous embodiments of the fitting according to the invention can be found in the subclaims.

Anhand eines in den Figuren der beiliegenden Zeichnung dargestellten Ausführungsbeispieles sei die Erfindung im folgenden näher erläutert. Es zeigen:

Fig. 1
einen Axialschnitt durch die erfindungsgemäße Armatur; und
Fig. 2
einen Schnitt nach Linie II-II in Fig. 1.
Based on an embodiment shown in the figures of the accompanying drawing, the invention is explained in more detail below. Show it:
Fig. 1
an axial section through the fitting according to the invention; and
Fig. 2
a section along line II-II in Fig. 1st

Gemäß Fig. 1 weist die Armatur ein kreuzförmiges Gehäuse 10 mit einem Wassereinlaßstutzen 12 und einem Wasserauslaßstutzen 14 auf, die miteinander fluchten. Mittels überwurfmuttern 16, 16′ können diese Stutzen 12, 14 an eine ankommende und abgehende Wasserleitung 18 angeschlossen werden. Nicht dargestellt sind Absperrventile, die vor und hinter der Armatur in der Wasserleitung 18 angeordnet sind und die geschlossen werden, wenn Wartungsarbeiten, z.B. ein Austausch der Ventile an der Armatur vorgenommen werden müssen.1, the fitting has a cross-shaped housing 10 with a water inlet connector 12 and a water outlet connector 14 which are aligned with one another. By means of union nuts 16, 16 ', these connecting pieces 12, 14 can be connected to an incoming and outgoing water pipe 18. Shut-off valves are not shown, which are arranged in front of and behind the fitting in the water line 18 and which are closed when maintenance work, e.g. the valves on the valve must be replaced.

Das Gehäuse 10 geht oberhalb der Ein- und Auslaßstutzen 12 und 14 in einen quaderförmigen Gehäuseteil 20 über, um sodann nach oben eine topfförmige Gestalt 22 einzunehmen.The housing 10 merges into a cuboid housing part 20 above the inlet and outlet ports 12 and 14, in order then to assume a cup-shaped shape 22 at the top.

In den quaderförmigen Gehäuseteil 20 sind von oben eine zentrale Bohrung 24 und zu beiden Seiten dieser zentralen Bohrung 24 zwei weitere Bohrungen 26 und 28 angebracht. Die Bohrungen 24 - 28 sind alle im Durchmesser abgesetzt, um in der zentralen Bohrung 24 einen Ventilstößel 30 und eine ihn umgebende Rückstellfeder 32 anordnen zu können und in den beiden anderen Bohrungen 26 und 28 Rückschlagventile 34 und 36 anzuordnen. Die Rückstellfeder 32 stützt sich an dem in der Bohrung 24 gebildeten Absatz 38 ab und die Rückschlagventile 34 und 36 stützen sich mit Ventilsitzkörpern 40 und 42 ebenfalls an Bohrungsabsätzen 44 und 46 ab. Beide Ventilsitzkörper 40 und 42 werden durch in Nuten 48 und 50 eingreifende Federringe 52 und 54 in ihrer dargestellten Lage gehalten. Durch unterschiedlich starke Federn 56 und 58 vorgespannte Schließkörper 60 und 62 stützen sich an entsprechenden Ventilsitzen an den Ventilsitzkörpern 40 und 42 ab.A central bore 24 is made from above in the cuboid housing part 20 and two further bores 26 and 28 are made on both sides of this central bore 24. The bores 24 - 28 are all offset in diameter in order to be able to arrange a valve tappet 30 and a return spring 32 surrounding it in the central bore 24 and to arrange check valves 34 and 36 in the other two bores 26 and 28. The return spring 32 is supported on the shoulder 38 formed in the bore 24 and the check valves 34 and 36 are also supported with valve seat bodies 40 and 42 on bore paragraphs 44 and 46. Both valve seat bodies 40 and 42 are held in their illustrated position by spring rings 52 and 54 engaging in grooves 48 and 50. Closing bodies 60 and 62, which are prestressed by springs 56 and 58 of different strengths, are supported on corresponding valve seats on the valve seat bodies 40 and 42.

Der Ventilstößel 30 ist über Membranteller 64 mit einer Membran 66 verbunden, die zwischen einem Flanschkragen 68 des topfförmigen Gehäuseteils 22 und einem Deckel 70 eingespannt ist. Die Verbindung zwischen Deckel und Gehäuse geschieht durch nicht dargestellte Schrauben. Der Ventilstößel 30 erstreckt sich durch die Membran 66 und durch eine weitere Membran 72 mit einem kleineren Durchmesser, die in einer zentralen Ausnehmung 74 im Deckel 70 mit nach innen springendem Flanschkragen 76 eingelegt ist. Der wirksame Membrandurchmesser der Membrane 72 entspricht dem Ventilsitzdurchmesser des Ventilsitzes 116. Die Ausnehmung 74 weist ein Innengewinde 78 auf, in das eine Gewindehaube 80 eingeschraubt ist, um die Membran 72 zwischen sich und dem Flanschkragen 76 einzuspannen. Eine Abstandshülse 82 und eine Widerlagerscheibe 84 geben einen konstanten Abstand zwischen beiden Membranen 66 und 72 vor und eine auf das Ende des Ventilstößels 30 aufgeschraubte Mutter 86 verspannt die ganze Anordnung. Die Gewindehaube 80 ist mit einer Atmungsöffnung 88 versehen.The valve lifter 30 is connected via a diaphragm plate 64 to a diaphragm 66, which is clamped between a flange collar 68 of the cup-shaped housing part 22 and a cover 70. The connection between cover and housing is done by screws, not shown. The valve lifter 30 extends through the membrane 66 and through a further membrane 72 with a smaller diameter, which also extends in a central recess 74 in the cover 70 inside collar flange 76 is inserted. The effective membrane diameter of the membrane 72 corresponds to the valve seat diameter of the valve seat 116. The recess 74 has an internal thread 78 into which a threaded hood 80 is screwed in order to clamp the membrane 72 between itself and the flange collar 76. A spacer sleeve 82 and a thrust washer 84 provide a constant distance between the two membranes 66 and 72 and a nut 86 screwed onto the end of the valve lifter 30 braces the entire arrangement. The threaded hood 80 is provided with a breathing opening 88.

Der Raum 94 zwischen den beiden Membranen 66 und 72 ist über einen Kanal 90 an den Wassereinlaßstutzen 12 angeschlossen. Ferner ist ein Prüfanschluß 92 im Deckel 70 vorgesehen, an dem der Eingangsdruck gemessen werden kann. In gleicher Weise verbindet ein Kanal 96 den Wasserauslaßstutzen 14 mit einem Prüfanschluß 98 im Deckel 70, an dem der Ausgangsdruck gemessen werden kann. Ein weiterer nicht dargestellter Prüfanschluß im Deckel 70 gestattet die Messung des Drucks in einem Zwischenraum 100 zwischen Hinterseite des Rückschlagventils 34 und Vorderseite des Rückschlagventils 36. Dieser Zwischenraum 100 steht über Ausnehmungen 102, 102′ (siehe Fig. 2) mit einer Ausgangs-Zwischenkammer 104 in Verbindung, die durch zwei Trennwände 106, 108 und ein Entlastungsventil 110 begrenzt wird. Das Entlastungsventil 110 sitzt in einem Ablaßstutzen 112, der sich konzentrisch zu dem Ventilstößel 30 nach unten erstreckt. In den Ablaßstutzen 112 ist ein Ventilsitzkörper 114 eingeschraubt, dessen Ventilsitz 116 mit einem an dem unteren Ende des Ventilstößels 30 angeordneten Schließkörper 118 zusammenwirkt. Schließlich ist auf den Ablaßstutzen 112 noch ein Ablaßtrichter 120 aufgeschraubt.The space 94 between the two membranes 66 and 72 is connected to the water inlet connection 12 via a channel 90. Furthermore, a test connection 92 is provided in the cover 70, at which the inlet pressure can be measured. In the same way, a channel 96 connects the water outlet connection 14 to a test connection 98 in the cover 70, at which the outlet pressure can be measured. Another test connection, not shown, in the cover 70 allows the measurement of the pressure in a space 100 between the rear of the check valve 34 and the front of the check valve 36. This space 100 is above recesses 102, 102 '(see FIG. 2) with an output intermediate chamber 104 connected, which is delimited by two partitions 106, 108 and a relief valve 110. The relief valve 110 is seated in a drain port 112 which extends downward concentrically to the valve lifter 30. In the drain port 112 is a Screwed in valve seat body 114, whose valve seat 116 interacts with a closing body 118 arranged at the lower end of the valve lifter 30. Finally, a drain funnel 120 is screwed onto the drain port 112.

Aus dem vorstehend beschriebenen Aufbau der Armatur ergibt sich folgende Wirkungsweise:
Bei statischen Druckverhältnissen, wenn der Wasserdruck am Einlaßstutzen 12 den Druck im Zwischenraum 100, 104 übersteigt und dieser Druck im Zwischenraum wiederum größer als der Druck im Auslaßstutzen 14 ist, sind beide Rückschlagventile 34 und 36 geschlossen. Ferner wird das Entlüftungsventil 110 durch den an der Membran 66 herrschenden Differenzdruck in der geschlossenen Stellung gehalten. Ein Wasserdurchfluß durch die Armatur findet nicht statt.The structure of the valve described above results in the following mode of operation:
In the case of static pressure conditions, when the water pressure at the inlet connection 12 exceeds the pressure in the intermediate space 100, 104 and this pressure in the intermediate space is again greater than the pressure in the outlet connection 14, both check valves 34 and 36 are closed. Furthermore, the vent valve 110 is held in the closed position by the differential pressure prevailing on the membrane 66. There is no water flow through the fitting.

Findet Durchfluß statt, so steigt der Differenzdruck zwischen Einlaßstutzen 12 und Auslaßstutzen 14 an. Bei Durchfluß sind beide Rückschlagventile geöffnet und es fließt Wasser von dem Einlaßstutzen 12 zu dem Auslaßstutzen 14. Vorgegeben durch die Vorspannfedern 56 und 58 der Rückschlagventile 34 und 36 ergeben sich abgestufte Drücke vom Eingang über die Zwischenkammer zum Ausgang. Diese Druckverhältnisse sind so, daß das Entlüftungsventil 110 infolge des auf die Membran 66 einwirkenden Differenzdruckes geschlossen bleibt.If flow takes place, the differential pressure between the inlet connector 12 and the outlet connector 14 increases. When flow through both check valves are open and water flows from the inlet port 12 to the outlet port 14. Preset by the biasing springs 56 and 58 of the check valves 34 and 36 result in graduated pressures from the inlet via the intermediate chamber to the outlet. These pressure ratios are such that the vent valve 110 remains closed due to the differential pressure acting on the membrane 66.

Unterschreitet der Differenzdruck zwichen Einlaßstutzen 12 und Zwischenkammer 14 einen vorbestimmten Wert, so sind beide Rückschlagventile 34 und 36 geschlossen und das Entlüftungsventil 110 wird geöffnet, so daß ein Rückfließen vom Ausgang zum Eingang nicht möglich ist und die dazwischen liegende Zwischenkammer 100, 104 durch das Entlüftungsventil 110 entlüftet bzw. entwässert wird.If the differential pressure between the inlet connection 12 and the intermediate chamber 14 falls below a predetermined value, then both check valves 34 and 36 are closed and the vent valve 110 is opened, so that a backflow from the exit to the inlet is not possible and the intermediate chamber 100, 104 through the vent valve 110 is vented or drained.

Auch in dem Fall, wo ein oder beide Rückschlagventile nicht dicht schließen, kann bei einem Druckanstieg auf der Ausgangsseite oder einem Unterdruck auf der Eingangsseite kein Wasser in der Leitung zurückfließen, da sich das Entlüftungsventil 110 in der geöffneten Stellung befindet.Even in the case where one or both check valves do not close tightly, no water can flow back in the line in the event of a pressure increase on the outlet side or a negative pressure on the inlet side, since the vent valve 110 is in the open position.

Claims (5)

  1. Apparatus for preventing backflow of water from a supply pipe comprising a housing (10) having an inlet and an outlet (12,14) as well as a venting opening, with two check valves (34,36) being arranged in flow direction and in a series connection within said housing, with a venting valve (110) connected to a chamber (100) between said check valves, with a cover (70) closing said housing which - when removed - makes said check valves accessible, whereat the cover clamps a diaphragm (66) between itself and the housing and a venting valve actuating rod (30) is suspended at said diaphragm, whereat a chamber (94) above the diaphragm is connected to the pressure in front of the first check valve (34) and whereat both check valves (34,36) are arranged parallel to the rod (30) of said venting valve (110), characterized in that the housing (10) is cross-shaped, that both check valves (34,36) are arranged in a plane which comprises the inlet and outlet (12,14), that the chamber (100) between both check valves and below of said diaphragm (66) by means of two connecting cut-outs (102,102') within said housing (10) is connected to an intermediate output chamber (104), which is ventable by said venting valve (110) and that both connecting cut-outs (102,102') enclose said rod (30) between themselves and are displaced with respect to each other by 180°.
  2. Apparatus according to claim 1, characterized in that the venting valve (110) is arranged within an outlet branch (112) which is concentrically arranged with respect to the symmetry axis of said housing (10).
  3. Apparatus according to claim 2, characterized in that a valve seat body (114) is screwed into said outlet branch (112) which comprises a valve seat (116) acting together with a valve body (118) at said rod (30).
  4. Apparatus according to claim 3, characterized in that the housing (10) comprises two separating walls (106,108) separating the inlet (12) from the outlet (14) and forming between themselves the intermediate output chamber (104) ventable by said venting valve (110).
  5. Apparatus according to one of claims 1 to 4, characterized in that the rod (30) is suspended at a further diaphragm (72) having an effective diameter which equals the diameter of the valve seat (116) of said venting valve (110).
EP88106643A 1988-04-26 1988-04-26 Plumbing device Expired - Lifetime EP0339104B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AT88106643T ATE66989T1 (en) 1988-04-26 1988-04-26 FITTING.
EP88106643A EP0339104B1 (en) 1988-04-26 1988-04-26 Plumbing device
DE8888106643T DE3864681D1 (en) 1988-04-26 1988-04-26 FITTING.
US07/339,280 US4895180A (en) 1988-04-26 1989-04-17 Anti-backflow valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP88106643A EP0339104B1 (en) 1988-04-26 1988-04-26 Plumbing device

Publications (2)

Publication Number Publication Date
EP0339104A1 EP0339104A1 (en) 1989-11-02
EP0339104B1 true EP0339104B1 (en) 1991-09-04

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Application Number Title Priority Date Filing Date
EP88106643A Expired - Lifetime EP0339104B1 (en) 1988-04-26 1988-04-26 Plumbing device

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US (1) US4895180A (en)
EP (1) EP0339104B1 (en)
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DE4100801C2 (en) * 1991-01-12 2001-11-08 Grohe Armaturen Friedrich Water tap
DE4142866C2 (en) * 1991-12-23 1994-03-03 Gruenbeck Josef Wasseraufb Pipe separator
DE4204386C2 (en) * 1992-02-14 1994-01-20 Honeywell Braukmann Gmbh System separator
IT1258989B (en) * 1992-06-12 1996-03-11 THREE-WAY DISCONNECTOR PARTICULARLY FOR DOMESTIC WATER DISTRIBUTION SYSTEMS
EP0671514A3 (en) * 1993-11-02 1996-03-06 Desch Kurt Michael Combined bathtub supply and overflow fixture with shower diverter valve and integrated backflow preventer.
DE102004044832B3 (en) * 2004-09-14 2006-01-19 Alfred Kärcher Gmbh & Co. Kg Backflow preventer
US7293576B2 (en) * 2005-03-28 2007-11-13 Potter Electric Signal Company Single-piece manifold with reduced pressure arrangement
JP5189399B2 (en) * 2008-04-07 2013-04-24 国立大学法人信州大学 Check valve
JP5189403B2 (en) * 2008-05-08 2013-04-24 国立大学法人信州大学 Backflow prevention device

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US4357954A (en) * 1980-07-21 1982-11-09 The Toro Company Backflow preventing valve construction
FR2544832B1 (en) 1983-04-22 1986-05-09 Bayard Sa Ets ANTI-RETURN DEVICE FOR A WATER SUPPLY NETWORK

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US4895180A (en) 1990-01-23
EP0339104A1 (en) 1989-11-02
DE3864681D1 (en) 1991-10-10
ATE66989T1 (en) 1991-09-15

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