EP0305557A1 - Anti-backflow valve for drinking water - Google Patents

Anti-backflow valve for drinking water Download PDF

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Publication number
EP0305557A1
EP0305557A1 EP87112648A EP87112648A EP0305557A1 EP 0305557 A1 EP0305557 A1 EP 0305557A1 EP 87112648 A EP87112648 A EP 87112648A EP 87112648 A EP87112648 A EP 87112648A EP 0305557 A1 EP0305557 A1 EP 0305557A1
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EP
European Patent Office
Prior art keywords
valve
pressure
inlet
drinking water
return
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Granted
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EP87112648A
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German (de)
French (fr)
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EP0305557B1 (en
Inventor
Claus Dipl.-Ing. Urner
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Honeywell Braukmann GmbH
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Honeywell Braukmann GmbH
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Application filed by Honeywell Braukmann GmbH filed Critical Honeywell Braukmann GmbH
Priority to AT87112648T priority Critical patent/ATE53878T1/en
Priority to EP87112648A priority patent/EP0305557B1/en
Priority to DE8787112648T priority patent/DE3762532D1/en
Publication of EP0305557A1 publication Critical patent/EP0305557A1/en
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    • 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
    • E03C1/104—Devices for preventing contamination of drinking-water pipes, e.g. means for aerating self-closing flushing valves using a single check valve
    • 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

Definitions

  • the present invention relates to a drinking water flow fitting according to the preamble of claim 1.
  • Such a fitting is known from DE-OS 34 42 748.
  • an inlet valve is connected upstream of the pipe separator, the actuating piston of which can optionally be connected to the inlet pressure or to the atmosphere via a pilot valve depending on the pressure conditions at the inlet and outlet of the valve.
  • a holding valve arranged in a bypass to a non-return valve serves to avoid switching vibrations, and a pilot valve also serves to vent the pipe string between the inlet valve and the pipe separator when the inlet valve is closed.
  • the main idea of the present invention is to provide a pressure compensation valve which allows the pressure difference introduced by the spring of the non-return valve to compensate for the pressure difference (0.5 bar) introduced in the absence of water withdrawal and when the non-return valve is closed.
  • the drinking water flow fitting comprises, as an essential component, a pipe separator 10 which has a cross-shaped housing 12.
  • a first valve seat 18 is arranged in the housing 12 between an inlet connection 14 of the housing 12 and an outlet connection 16. Coaxial to this first valve seat 18 there is a second valve seat 20 which is offset downwards.
  • a tubular sealing piston 22 which is closed at the top is displaceable in both valve seats 18, 20 and which have the same diameter and forms a check valve with the first valve seat 18 and with the valve valve 18 second valve seat 20 a drain valve.
  • the drain valve 20, 22 opens into a drain port 24, below which a collecting funnel 26 is arranged. Between an inwardly drawn collar 28 of the drain port 24 and the locking piston 22, a loading spring 30 is supported, which acts on the locking piston 22 so that it is moved into a position closing the check valve 18, 22.
  • a check valve 32 is arranged, which is modified according to the invention and will be described in more detail below.
  • a relief piston 36 is connected via a rod 34, which is guided in a sealed manner in the housing 12.
  • An inwardly projecting collar of the housing 12 limits the displacement of the closure piston 22, rod 34 and relief piston 36 upwards.
  • the space above the relief piston 36 can optionally be connected to the inlet pressure or to the atmosphere via a 3-way valve 38.
  • the 3-way valve 38 is controlled by a pressure comparison device 40 via a tappet 72.
  • the pressure comparison device 40 comprises a housing divided by a membrane 70 into an upper chamber 42 and a lower chamber 44, the upper chamber 42 via a line 48, 48 ⁇ to the inlet pressure and the lower chamber 44 via a line 50 to the outlet pressure connected.
  • a spring 46 in the lower chamber 44 counteracts the inlet pressure in the same sense as the outlet pressure.
  • a branch line 48 ' which carries the inlet pressure, can be connected via the 3-way valve 38 to the chamber above the relief piston 36; this space can likewise be vented into the atmosphere via the 3-way valve 38 and a line 52 or emptied into a funnel 54.
  • the backflow preventer valve 32 comprises a valve seat 56 which jumps inwards in the extraction line and which cooperates with a closing body 58.
  • the closing body 58 is guided via a valve rod 60 in a hub 62, which is connected to the inner tube wall via radial webs 64.
  • a spring 66 is supported between the hub 62 and the closing body 58 and presses the closing body 58 against the valve seat 56.
  • a pressure compensation valve 68 is installed in the closing body 58, which is preferably designed as a ball check valve.
  • a non-return valve which corresponds to a commercial non-return valve except for the modification of the valve rod and can be used in FIG. 1 instead of the non-return valve 32.
  • the backflow preventer valve 100 consists of two housing halves 102, 104 which are provided with flanges 106 and 108 on the inlet and outlet sides.
  • a radially directed bore 110 is machined into the outlet-side flange 108, via which the outlet-side pressure is removed.
  • Both housing halves 102 and 104 are connected to one another by screws with the interposition of an elastic valve seat seal 112.
  • Radially directed webs 114 and 116 are formed on both housing halves 102 and 104, which merge into central hubs 118 and 120, into which threaded sleeves 122 and 124 are screwed. These threaded sleeves serve as Slide bushings for a valve rod 126.
  • a valve plate 130 pushed over the valve rod 126 against a stop 128 is secured by a screw nut 132. Between the stop 128 and the threaded sleeve 124, a spring 134 is supported, which tries to push the valve plate 130 together with the valve rod 126 against the valve seat 112.
  • the backflow preventer valve As far as the backflow preventer valve has been described so far, it is a known and commercially available valve.
  • a bore 136 is made in the valve rod 26 from the front, which ends behind the valve plate 130 and connects the space in front of the valve plate 130 with the space behind the valve plate 130.
  • a ball check valve 138 is inserted into the bore 136 as a pressure compensation valve.
  • This ball check valve 138 is also of a commercially available type and is screwed into the bore 136 of the valve rod 126 from the front.
  • the open state of the check valve with open ball check valve is shown above the line of symmetry and the closed state of the check valve with closed ball check valve is shown below the line of symmetry.
  • the pressure difference of 0.5 bar specified by the spring 66 is reduced by the pressure compensation valve 68, so that pressure compensation takes place and the pressures in both chambers 42, 44 of the pressure comparison device 40 correspond to one another.
  • the spring 46 pushes the actuating rod 72 of the 3-way valve 38 upward, so that the space above the relief piston 36 is connected to the atmosphere via line 52.
  • the pipe separator thus goes into the disconnected position due to the action of the spring 30, in which the shut-off valve 18, 22 is closed and the drain valve 20, 22 is open.
  • the non-return valve 32 goes into the blocking position shown, and the pressure equalization valve 68 is used to equalize the pressure on the inlet side and the pressure on the outlet side. If the pressure is equal, however, the spring 46 of the pressure comparison device 40 brings the 3-way valve 38 into a position via the actuating rod 72, in which the space above the relief piston 36 is vented, so that the pipe separator returns to the disconnected position, in which the check valve 18, 22 is closed.

Abstract

1. Drinking water flow installation comprising in a series connection a pipe separation unit (10) and a back flow preventer valve (32, 100) and further comprising a control valve (38), which compares the pressure at the inlet and the outlet of the installation with each other in order to connect a piston (36) actuating the pipe separation unit (10) to the inlet pressure or the atmosphere, respectively as a function of the pressure condition, characterized in that a pressure balancing valve (68, 138) is intergrated with the back flow preventer valve (32, 100).

Description

Die vorliegende Erfindung bezieht sich auf eine Trinkwasser-Durchflußarmatur nach dem Gattungsbegriff des Patentanspruches 1.The present invention relates to a drinking water flow fitting according to the preamble of claim 1.

Eine derartige Armatur ist aus der DE-OS 34 42 748 bekannt. Bei dieser bekannten Armatur ist dem Rohrtrenner ein Zulaufventil vorgeschaltet, dessen Betätigungskolben über ein Vorsteuerventil in Abhängigkeit von den Druckver­hältnissen am Ein- und Ausgang der Armatur wahlweise an den Eingangsdruck bzw. an die Atmosphäre angeschlossen werden kann. Ein in einem Bypass zu einem Rückflußverhindererventil angeordnetes Halteventil dient der Vermeidung von Schalt­schwingungen, und ein Pilotventil dient ferner der Entlüftung des Rohrstranges zwischen Zulaufventil und Rohrtrenner bei geschlossenem Zulaufventil.Such a fitting is known from DE-OS 34 42 748. In this known valve an inlet valve is connected upstream of the pipe separator, the actuating piston of which can optionally be connected to the inlet pressure or to the atmosphere via a pilot valve depending on the pressure conditions at the inlet and outlet of the valve. A holding valve arranged in a bypass to a non-return valve serves to avoid switching vibrations, and a pilot valve also serves to vent the pipe string between the inlet valve and the pipe separator when the inlet valve is closed.

Diese relativ aufwendige Armatur hat im Stand der Technik eine Verbesserung dahin gehend erfahren, daß die Druckvergleichsvorrichtung in den Rohrtrenner integriert wurde (DE-PS 33 47 805).This relatively complex fitting has undergone an improvement in the prior art in that the pressure comparison device has been integrated into the pipe separator (DE-PS 33 47 805).

Weitere Ausgestaltungen dieser hydraulisch gesteuerten Rohrtrenner befassen sich mit der Vermeidung von Schaltschwingungen (DE-OS'en 32 47 325 und 35 20 250).Further configurations of these hydraulically controlled pipe separators deal with the avoidance of Switching vibrations (DE-OS'en 32 47 325 and 35 20 250).

Alle diese bekannten Lösungen stellen voll automatisch und hydraulisch gesteuerte Rohrtrenner nach Einbauart 2 oder 3 dar, bei denen gefordert wird, daß der Rohrtrenner nur bei tatsächlicher Wasserentnahme in die Durchflußstellung geht. Umgekehrt muß natürlich bei fehlender Wasserentnahme der Rohrtrenner in die Trennstellung gehen.All of these known solutions represent fully automatically and hydraulically controlled pipe separators according to installation type 2 or 3, in which it is required that the pipe separator only goes into the flow position when water is actually drawn. Conversely, the pipe separator must of course go into the disconnected position if there is no water withdrawal.

Es ist die Aufgabe der vorliegenden Erfindung, eine Trinkwasser-Durchflußarmatur anzugeben, die diesen Anforderungen bei äußerst einfachem Aufbau gerecht wird. Die Lösung dieser Aufgabe gelingt gemäß den kennzeichnenden Merkmalen des Patentanspruches 1. Weitere vorteilhafte Ausgestaltungen der erfindungsgemäßen Armatur sind den Unteransprüchen entnehmbar.It is the object of the present invention to provide a drinking water flow fitting which meets these requirements with an extremely simple structure. This object is achieved according to the characterizing features of claim 1. Further advantageous refinements of the fitting according to the invention can be found in the subclaims.

Der wesentliche Gedanke der vorliegenden Erfindung liegt darin, ein Druckausgleichsventil vorzusehen, das bei fehlender Wasserentnahme und bei geschlossenem Rückflußverhindererventil die durch die Feder des Rückflußverhindererventils eingeführte Druckdifferenz (0,5 bar) auszugleichen gestattet.The main idea of the present invention is to provide a pressure compensation valve which allows the pressure difference introduced by the spring of the non-return valve to compensate for the pressure difference (0.5 bar) introduced in the absence of water withdrawal and when the non-return valve is closed.

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

  • Figur 1 das Prinzipschema einer erfindungsgemäßen Trinkwasser-Durchflußarmatur; und
  • Figur 2 ein erfindungsfunktionell ausgebildetes Rückflußverhindererventil.
Based on the embodiments shown in the figures of the accompanying drawing, the following is the Invention explained in more detail. Show it:
  • Figure 1 shows the schematic diagram of a drinking water flow fitting according to the invention; and
  • Figure 2 shows a check valve designed according to the invention.

Gemäß Figur 1 umfaßt die Trinkwasser-Durchflußarmatur als wesentlichen Bestandteil einen Rohrtrenner 10, der ein kreuzförmiges Gehäuse 12 aufweist. Zwischen einem Einlaßstutzen 14 des Gehäuses 12 und einem Auslaßstutzen 16 ist ein erster Ventilsitz 18 in dem Gehäuse 12 angeordnet. Koaxial zu diesem ersten Ventilsitz 18 befindet sich nach unten versetzt ein zweiter Ventilsitz 20. Ein rohrförmiger nach oben abgeschlossener Verschlußkolben 22 ist in beiden Ventilsitzen 18, 20, die den gleichen Durchmesser aufweisen, verschiebbar und bildet mit dem ersten Ventilsitz 18 ein Sperrventil und mit dem zweiten Ventilsitz 20 ein Ablaßventil.According to FIG. 1, the drinking water flow fitting comprises, as an essential component, a pipe separator 10 which has a cross-shaped housing 12. A first valve seat 18 is arranged in the housing 12 between an inlet connection 14 of the housing 12 and an outlet connection 16. Coaxial to this first valve seat 18 there is a second valve seat 20 which is offset downwards. A tubular sealing piston 22 which is closed at the top is displaceable in both valve seats 18, 20 and which have the same diameter and forms a check valve with the first valve seat 18 and with the valve valve 18 second valve seat 20 a drain valve.

Das Ablaßventil 20, 22 mündet in einen Ablaßstutzen 24, unter welchem ein Sammeltrichter 26 angeordnet ist. Zwischen einem nach innen gezogenen Bund 28 des Ablaßstutzens 24 und dem Verschlußkolben 22 stützt sich eine Belastungsfeder 30 ab, die den Verschlußkolben 22 so beaufschlagt, daß er in eine das Sperrventil 18, 22 schließende Stellung bewegt wird.The drain valve 20, 22 opens into a drain port 24, below which a collecting funnel 26 is arranged. Between an inwardly drawn collar 28 of the drain port 24 and the locking piston 22, a loading spring 30 is supported, which acts on the locking piston 22 so that it is moved into a position closing the check valve 18, 22.

Im Auslaßstutzen 16 ist ein Rückflußverhindererventil 32 angeordnet, das erfindungsgemäß modifiziert ist und nachstehend noch näher beschrieben wird.In the outlet 16, a check valve 32 is arranged, which is modified according to the invention and will be described in more detail below.

Mit dem Verschlußkolben 22 ist über eine Stange 34 ein Entlastungskolben 36 verbunden, der in dem Gehäuse 12 abgedichtet geführt ist. Ein nach innen ragender Bund des Gehäuses 12 begrenzt den Verschiebeweg von Verschlußkolben 22, Stange 34 und Entlastungskolben 36 nach oben.With the locking piston 22, a relief piston 36 is connected via a rod 34, which is guided in a sealed manner in the housing 12. An inwardly projecting collar of the housing 12 limits the displacement of the closure piston 22, rod 34 and relief piston 36 upwards.

Der Raum über dem Entlastungskolben 36 ist über ein 3-Wege-Ventil 38 wahlweise an den Eingangsdruck bzw. an die Atmosphäre anschließbar. Das 3-Weg-Ventil 38 wird von einer Druckvergleichseinrichtung 40 über einen Stößel 72 gesteuert. Die Druckvergleichseinrichtung 40 umfaßt ein durch eine Membran 70 in eine obere Kammer 42 und eine untere Kammer 44 unterteiltes Gehäuse, wobei die obere Kammer 42 über eine Leitung 48, 48˝ an den Eingangsdruck und die untere Kammer 44 über eine Leitung 50 an den ausgangsseitigen Druck angeschlossen ist. Eine Feder 46 in der unteren Kammer 44 wirkt im gleichen Sinne wie der Ausgangsdruck dem Eingangsdruck entgegen. Eine Abzweigleitung 48′, die den Eingangsdruck führt, kann über das 3-Wege-Ventil 38 an die Kammer oberhalb des Entlastungs­kolbens 36 angeschlossen werden; ebenso kann dieser Raum über das 3-Wege-Ventil 38 und eine Leitung 52 in die Atmosphäre entlüftet bzw. in einen Trichter 54 entleert werden.The space above the relief piston 36 can optionally be connected to the inlet pressure or to the atmosphere via a 3-way valve 38. The 3-way valve 38 is controlled by a pressure comparison device 40 via a tappet 72. The pressure comparison device 40 comprises a housing divided by a membrane 70 into an upper chamber 42 and a lower chamber 44, the upper chamber 42 via a line 48, 48˝ to the inlet pressure and the lower chamber 44 via a line 50 to the outlet pressure connected. A spring 46 in the lower chamber 44 counteracts the inlet pressure in the same sense as the outlet pressure. A branch line 48 ', which carries the inlet pressure, can be connected via the 3-way valve 38 to the chamber above the relief piston 36; this space can likewise be vented into the atmosphere via the 3-way valve 38 and a line 52 or emptied into a funnel 54.

Das Rückflußverhindererventil 32 umfaßt einen in dem Entnahmestrang nach innen springenden Ventilsitz 56, der mit einem Schließkörper 58 zusammenarbeitet. Der Schließkörper 58 ist über eine Ventilstange 60 in einer Nabe 62 geführt, die über radiale Stege 64 mit der Rohrinnenwand verbunden ist. Eine Feder 66 stützt sich zwischen der Nabe 62 und dem Schließkörper 58 ab und preßt den Schließkörper 58 gegen den Ventilsitz 56. In den Schließkörper 58 ist ein Druckaus­gleichsventil 68 eingebaut, welches vorzugsweise als Kugelrückschlagventil ausgebildet ist.The backflow preventer valve 32 comprises a valve seat 56 which jumps inwards in the extraction line and which cooperates with a closing body 58. The closing body 58 is guided via a valve rod 60 in a hub 62, which is connected to the inner tube wall via radial webs 64. A spring 66 is supported between the hub 62 and the closing body 58 and presses the closing body 58 against the valve seat 56. A pressure compensation valve 68 is installed in the closing body 58, which is preferably designed as a ball check valve.

Gemäß Figur 2 ist ein Rückflußverhindererventil dargestellt, das bis auf die Modifikation der Ventilstange einem handelsüblichen Rückflußverhindererventil entspricht und in Figur 1 anstelle des Rückflußverhindererventils 32 eingesetzt werden kann.According to FIG. 2, a non-return valve is shown, which corresponds to a commercial non-return valve except for the modification of the valve rod and can be used in FIG. 1 instead of the non-return valve 32.

Das Rückflußverhindererventil 100 gemäß Figur 2 besteht aus zwei Gehäusehälften 102, 104, die ein- und ausgangsseitig mit Flanschen 106 und 108 versehen sind. In den ausgangs­seitigen Flansch 108 ist eine radial gerichtete Bohrung 110 eingearbeitet, über die der ausgangsseitige Druck abgenommen wird. Beide Gehäusehälften 102 und 104 sind unter Zwischenfügung einer elastischen Ventilsitzdichtung 112 durch Schrauben miteinander verbunden. An beiden Gehäusehälften 102 und 104 sind radial gerichtete Stege 114 und 116 angeformt, die in jeweils zentrale Naben 118 und 120 übergehen, in welche Gewindehülsen 122 und 124 eingeschraubt sind. Diese Gewindehülsen dienen als Gleitbuchsen für eine Ventilstange 126. Ein über die Ventilstange 126 gegen einen Anschlag 128 geschobener Ventilteller 130 ist durch eine Schraubenmutter 132 gesichert. Zwischen dem Anschlag 128 und der Gewindehülse 124 stützt sich eine Feder 134 ab, die den Ventilteller 130 samt Ventilstange 126 gegen den Ventilsitz 112 zu schieben versucht. Soweit das Rückflußverhindererventil bis hierhin beschrieben wurde, handelt es sich um ein bekanntes und handelsübliches Ventil.The backflow preventer valve 100 according to FIG. 2 consists of two housing halves 102, 104 which are provided with flanges 106 and 108 on the inlet and outlet sides. A radially directed bore 110 is machined into the outlet-side flange 108, via which the outlet-side pressure is removed. Both housing halves 102 and 104 are connected to one another by screws with the interposition of an elastic valve seat seal 112. Radially directed webs 114 and 116 are formed on both housing halves 102 and 104, which merge into central hubs 118 and 120, into which threaded sleeves 122 and 124 are screwed. These threaded sleeves serve as Slide bushings for a valve rod 126. A valve plate 130 pushed over the valve rod 126 against a stop 128 is secured by a screw nut 132. Between the stop 128 and the threaded sleeve 124, a spring 134 is supported, which tries to push the valve plate 130 together with the valve rod 126 against the valve seat 112. As far as the backflow preventer valve has been described so far, it is a known and commercially available valve.

Gemäß der vorliegenden Erfindung ist in der Ventilstange 26 von vorne eine Bohrung 136 angebracht, die hinter dem Ventilteller 130 endet und den Raum vor dem Ventilteller 130 mit dem Raum hinter dem Ventilteller 130 verbindet. In die Bohrung 136 ist ein Kugelrückschlagventil 138 als Druckausgleichsventil eingesetzt. Dieses Kugelrück­schlagventil 138 ist ebenfalls von handelsüblicher Bauart und wird von vorne in die Bohrung 136 der Ventilstange 126 eingeschraubt. In der Zeichnung ist oberhalb der Symmetrie­linie der geöffnete Zustand des Rückflußverhindererventils mit offenen Kugelrückschlagventil und unterhalb der Symmetrielinie der geschlossene Zustand des Rückfluß­verhindererventils mit geschlossenem Kugelrückschlagventil dargestellt.According to the present invention, a bore 136 is made in the valve rod 26 from the front, which ends behind the valve plate 130 and connects the space in front of the valve plate 130 with the space behind the valve plate 130. A ball check valve 138 is inserted into the bore 136 as a pressure compensation valve. This ball check valve 138 is also of a commercially available type and is screwed into the bore 136 of the valve rod 126 from the front. In the drawing, the open state of the check valve with open ball check valve is shown above the line of symmetry and the closed state of the check valve with closed ball check valve is shown below the line of symmetry.

Aus dem anhand von Figur 1 beschriebenen Aufbau der Armatur ergibt sich folgende Wirkungsweise:
Beim erstmaligen Füllen der Armatur dominiert der eingangsseitige Druck über den ausgangsseitigen Druck, und die Druckvergleichseinrichtung 40 betätigt das 3-Wege-Ventil 38 in der Weise, daß der eingangsseitige Druck über die Leitungen 48, 48′ dem Raum über dem Entlastungskolben 36 zugeführt wird. Hierdurch nimmt der Rohrtrenner die in Figur 1 dargestellt Lage ein, bei der das Absperrventil 18, 22 geöffnet und das Ablaßventil 20, 22 geschlossen ist. Das Rückflußverhindererventil 32 wird kurzfristig geöffnet, um sodann nach Füllung der Armatur durch die Feder 66 wieder geschlossen zu werden. Der durch die Feder 66 vorgegebene Druckunterschied von 0,5 bar baut sich durch das Druckausgleichsventil 68 ab, so daß ein Druckausgleich stattfindet und die Drücke in beidem Kammern 42, 44 der Druckvergleichseinrichtung 40 einander entsprechen. In diesem Fall schiebt die Feder 46 die Betätigungsstange 72 des 3-Wege-Ventils 38 nach oben, so daß der Raum über dem Entlastungskolben 36 an die Atmosphäre über die Leitung 52 angeschlossen wird. Der Rohrtrenner geht somit aufgrund der Wirkung der Feder 30 in die Trennstellung, in der das Sperrventil 18, 22 geschlossen ist und das Ablaßventil 20, 22 geöffnet ist.The following mode of operation results from the structure of the fitting described with reference to FIG. 1:
When the valve is filled for the first time, the inlet pressure dominates over the outlet pressure, and the pressure comparison device 40 actuates the 3-way valve 38 in such a way that the input-side pressure is supplied via the lines 48, 48 'to the space above the relief piston 36. As a result, the pipe separator assumes the position shown in FIG. 1, in which the shut-off valve 18, 22 is open and the drain valve 20, 22 is closed. The backflow preventer valve 32 is opened briefly so that it can then be closed again by the spring 66 after the valve has been filled. The pressure difference of 0.5 bar specified by the spring 66 is reduced by the pressure compensation valve 68, so that pressure compensation takes place and the pressures in both chambers 42, 44 of the pressure comparison device 40 correspond to one another. In this case, the spring 46 pushes the actuating rod 72 of the 3-way valve 38 upward, so that the space above the relief piston 36 is connected to the atmosphere via line 52. The pipe separator thus goes into the disconnected position due to the action of the spring 30, in which the shut-off valve 18, 22 is closed and the drain valve 20, 22 is open.

Wird ausgangsseitig auf der Brauchwasserseite Wasser entnommen, so bricht der Hinterdruck hinter dem Rückfluß­verhindererventil 32 zusammen, so daß nunmehr der eingangsseitige Druck dominiert und die Druckvergleichs­einrichtung 40 über die Betätigungsstange 72 das 3-Wege-Ventil 38 in die Stellung bringt, in der der Raum über dem Entlastungskolben 36 an den Eingangsdruck angeschlossen ist. Der Rohrtrenner geht hierdurch wiederum in die in Figur 1 dargestellte Durchflußstellung, wobei zusätzlich noch das Rückflußverhindererventil 32 geöffnet wird. Solange Wasser entnommen wird, ist der Druck hinter dem Rückflußverhindererventil 32 mindestens um 0,5 bar geringer als der eingangsseitige Druck, und dieser Druckunterschied ist ausreichend, um über die Druck­vergleichseinrichtung 40 das 3-Wege-Ventil 38 in der Stellung zu halten, in der der Eingangsdruck dem Raum über dem Entlastungkolben 36 zugeführt wird. Ist die Wasser­entnahme beendet, so geht das Rückflußverhindererventil 32 in die dargestellte Sperrstellung, und über das Druckausgleichsventil 68 erfolgt ein Druckausgleich zwischen dem Druck auf der Eingangsseite und dem Druck auf der Ausgangsseite. Bei Druckgleichheit bringt aber die Feder 46 der Druckvergleichseinrichtung 40 über die Betätigungsstange 72 das 3-Wege-Ventil 38 in eine Stellung, in der der Raum über dem Entlastungskolben 36 entlüftet wird, so daß der Rohrtrenner wieder in die Trennstellung geht, in der das Sperrventil 18, 22 geschlossen ist.If water is taken on the outlet side on the process water side, the back pressure behind the backflow preventer valve 32 collapses, so that now the inlet side pressure dominates and the pressure comparison device 40 brings the 3-way valve 38 into the position in which the space over via the actuating rod 72 the relief piston 36 is connected to the inlet pressure. The pipe separator goes through this again in the flow position shown in Figure 1, wherein in addition the backflow preventer valve 32 is opened. As long as water is removed, the pressure behind the backflow preventer valve 32 is at least 0.5 bar lower than the pressure on the inlet side, and this pressure difference is sufficient to hold the 3-way valve 38 in the position via the pressure comparison device 40 the inlet pressure is supplied to the space above the relief piston 36. When the water removal has ended, the non-return valve 32 goes into the blocking position shown, and the pressure equalization valve 68 is used to equalize the pressure on the inlet side and the pressure on the outlet side. If the pressure is equal, however, the spring 46 of the pressure comparison device 40 brings the 3-way valve 38 into a position via the actuating rod 72, in which the space above the relief piston 36 is vented, so that the pipe separator returns to the disconnected position, in which the check valve 18, 22 is closed.

Claims (4)

1. Trinkwasser-Durchflußarmatur mit in einem Rohrstrang hintereinander angeordnetem Rohrtrenner und Rückfluß­verhindererventil und mit einem Steuerventil, welches den ein- und ausgangsseitigen Druck der Durchflußarmatur miteinander vergleicht, um in Abhängigkeit von den Druckverhältnissen einen den Rohrtrenner betätigenden Kolben an den eingangsseitigen Druck bzw. an die Atmosphäre anzuschließen, dadurch ge­kennzeichnet, daß in das Rückflußverhindererventil (32, 100) ein Druckausgleichsventil (68, 138) integriert ist.1. Drinking water flow fitting with a pipe separator and backflow preventer valve arranged one behind the other in a pipe string and with a control valve which compares the inlet and outlet pressure of the flow fitting with each other in order to use a piston actuating the pipe separator to the inlet pressure or to the pressure depending on the pressure conditions To connect the atmosphere, characterized in that a pressure compensation valve (68, 138) is integrated in the non-return valve (32, 100). 2. Armatur nach Anspruch 1, dadurch ge­kennzeichnet, daß das Druckausgleichsventil (68, 138) in dem Schließkörper (58, 126) des Rückfluß­verhindererventils (32, 100) angeordnet ist.2. Fitting according to claim 1, characterized in that the pressure compensation valve (68, 138) in the closing body (58, 126) of the non-return valve (32, 100) is arranged. 3. Armatur nach Anspruch 2, wobei das Rückflußverhinderer­ventil einen Ventilteller aufweist, der auf eine in wenigstens einer Nabe geführten Ventilstange sitzt und wobei eine Feder den Ventilteller und die Ventilstange gegen einen elastischen Ventilsitz vorspannt, da­durch gekennzeichnet, daß die Ventilstange (126) eine Bohrung (136) aufweist, in der das Druckausgleichsventil (138) angeordnet ist, wobei die Bohrung (136) den Raum vor dem Rückflußverhindererventil mit dem Raum hinter dem Rückflußverhindererventil verbindet.3. Fitting according to claim 2, wherein the backflow preventer valve has a valve plate which sits on a valve rod guided in at least one hub and wherein a spring biases the valve plate and the valve rod against an elastic valve seat, characterized in that the valve rod (126) has a bore (136), in which the pressure compensation valve (138) is arranged, the bore (136) connecting the space in front of the non-return valve to the space behind the non-return valve. 4. Armatur nach Anspruch 3, dadurch gekenn­zeichnet, daß das Druckausgleichsventil ein Kugelrückschlagventil (138) ist.4. Fitting according to claim 3, characterized in that the pressure compensation valve is a ball check valve (138).
EP87112648A 1987-08-31 1987-08-31 Anti-backflow valve for drinking water Expired - Lifetime EP0305557B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT87112648T ATE53878T1 (en) 1987-08-31 1987-08-31 DRINKING WATER FLOW FITTING.
EP87112648A EP0305557B1 (en) 1987-08-31 1987-08-31 Anti-backflow valve for drinking water
DE8787112648T DE3762532D1 (en) 1987-08-31 1987-08-31 DRINKING WATER FLOW TAP.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP87112648A EP0305557B1 (en) 1987-08-31 1987-08-31 Anti-backflow valve for drinking water

Publications (2)

Publication Number Publication Date
EP0305557A1 true EP0305557A1 (en) 1989-03-08
EP0305557B1 EP0305557B1 (en) 1990-05-02

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ID=8197236

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87112648A Expired - Lifetime EP0305557B1 (en) 1987-08-31 1987-08-31 Anti-backflow valve for drinking water

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EP (1) EP0305557B1 (en)
AT (1) ATE53878T1 (en)
DE (1) DE3762532D1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0555837A1 (en) * 1992-02-14 1993-08-18 Honeywell Ag Backflow preventer
EP1334761A1 (en) * 2002-02-07 2003-08-13 Bucher Guyer AG Cross-flow filtration device and backflow throttle valve for use in such an installation and method for operating a such installation

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE206551C (en) *
DE577314C (en) * 1931-06-21 1933-05-29 Hermann Baumann Device to prevent water from flowing back into water pipes
WO1984002544A1 (en) * 1982-12-21 1984-07-05 Gruenbeck Josef Wasseraufb Pipe separator
DE3347805A1 (en) * 1983-06-29 1985-02-28 Schubert & Salzer Maschinenfabrik Ag, 8070 Ingolstadt Device for matching the response pressure to the pressure conditions in the outlet line in an apparatus for preventing return flow of a medium out of an outlet line into the inlet line
DE3442748A1 (en) * 1984-11-23 1986-05-28 Lang Apparatebau GmbH, 8227 Siegsdorf DEVICE FOR PROTECTING DRINKING WATER PIPES
EP0189499A1 (en) * 1985-01-30 1986-08-06 Honeywell-Braukmann GmbH Tube disconnector
DE3520250A1 (en) * 1985-06-05 1986-12-11 Grünbeck Wasseraufbereitung GmbH, 8884 Höchstädt TUBE DISCONNECTOR

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE206551C (en) *
DE577314C (en) * 1931-06-21 1933-05-29 Hermann Baumann Device to prevent water from flowing back into water pipes
WO1984002544A1 (en) * 1982-12-21 1984-07-05 Gruenbeck Josef Wasseraufb Pipe separator
DE3347805A1 (en) * 1983-06-29 1985-02-28 Schubert & Salzer Maschinenfabrik Ag, 8070 Ingolstadt Device for matching the response pressure to the pressure conditions in the outlet line in an apparatus for preventing return flow of a medium out of an outlet line into the inlet line
DE3442748A1 (en) * 1984-11-23 1986-05-28 Lang Apparatebau GmbH, 8227 Siegsdorf DEVICE FOR PROTECTING DRINKING WATER PIPES
EP0189499A1 (en) * 1985-01-30 1986-08-06 Honeywell-Braukmann GmbH Tube disconnector
DE3520250A1 (en) * 1985-06-05 1986-12-11 Grünbeck Wasseraufbereitung GmbH, 8884 Höchstädt TUBE DISCONNECTOR

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0555837A1 (en) * 1992-02-14 1993-08-18 Honeywell Ag Backflow preventer
EP1334761A1 (en) * 2002-02-07 2003-08-13 Bucher Guyer AG Cross-flow filtration device and backflow throttle valve for use in such an installation and method for operating a such installation

Also Published As

Publication number Publication date
ATE53878T1 (en) 1990-06-15
EP0305557B1 (en) 1990-05-02
DE3762532D1 (en) 1990-06-07

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