EP0452426B1 - Backflow preventer, especially for fitting in drinking water pipes - Google Patents

Backflow preventer, especially for fitting in drinking water pipes Download PDF

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Publication number
EP0452426B1
EP0452426B1 EP90910582A EP90910582A EP0452426B1 EP 0452426 B1 EP0452426 B1 EP 0452426B1 EP 90910582 A EP90910582 A EP 90910582A EP 90910582 A EP90910582 A EP 90910582A EP 0452426 B1 EP0452426 B1 EP 0452426B1
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EP
European Patent Office
Prior art keywords
valve
aperture
central chamber
outlet
chamber
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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
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EP90910582A
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German (de)
French (fr)
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EP0452426A1 (en
Inventor
Walter Evers
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Waletzko Armaturen GmbH
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Waletzko Armaturen GmbH
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Priority to AT90910582T priority Critical patent/ATE83023T1/en
Publication of EP0452426A1 publication Critical patent/EP0452426A1/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
    • E03C1/106—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

Definitions

  • the invention relates to a non-return valve, in particular for installation in drinking water pipes, which is provided with a flow housing containing an inlet and outlet, a spring-loaded inlet valve accommodated therein and a spring-loaded outlet valve, and a central chamber arranged between the two valves, which provides the outside atmosphere via A drain valve that opens when the pressure drops below a certain minimum differential pressure between the supply line and the middle chamber is to be connected, the valve body of which is connected to a control element which can be acted upon on the one hand by the pressure prevailing in the supply line and on the other hand by the pressure prevailing in the middle chamber, and thereby by its drain valve seat with the release of both a water outlet opening and one above it ventilation opening leading to the middle chamber is to be lifted off.
  • Backflow preventers of the above type are known, for example, from DE-A-2 450 465, EP-A-0 084 754 and DE-C-28 54 003. They ensure that the liquid pressure prevailing in the middle chamber is always lower than the liquid pressure present in the feed line, as a result of which even defective ones or a leaky inlet valve prevents backflow of the liquid from the middle chamber or discharge into the feed line.
  • the drain valve which operates as a function of the differential pressure, is opened, not only is a corresponding water outlet opening exposed, but at the same time a ventilation opening leading to the central chamber is also exposed through the same valve body.
  • the valve body is designed as a valve body tube installed vertically in the central chamber, with its lower end the water outlet opening leading directly from the central chamber into the outside atmosphere and with its upper end that between the central chamber and ventilation opening located through the interior of the valve body tube controls ventilation opening.
  • the differential pressure-dependent discharge valve body also functions as a double-body valve, in which the lower end of the water outlet opening located between the central chamber and the outside atmosphere and the upper end of the ventilation opening between the central chamber and controls the outside atmosphere in terms of valves.
  • the double valve design of the drain valve requires considerable additional construction work.
  • the invention is therefore based on the object of providing a backflow preventer of the type mentioned at the outset, which is simpler in terms of its drain valve which allows the central chamber to be connected to the outside atmosphere It is designed and ensures good drainage with improved ventilation of the middle chamber.
  • the backflow preventer is provided with a tubular discharge valve housing flanged to the side of its flow housing at the level of its central chamber, each of which has the control element and its bilateral pressurization chambers, a control rod with the piston-like valve body seated at its lower end, and the like contains an outlet valve outlet opening surrounded by an annular valve seat, a passage opening leading directly to the middle chamber being provided immediately above this valve seat in the valve housing wall, which through the valve body piston moving past it during its opening stroke increasingly expose it is and which thereby forms the integrated, valve body-controlled connection opening together with the drain valve outlet opening located immediately below it.
  • the passage opening leading to the middle chamber has a larger cross-section than the drain valve outlet opening located directly below it and there is a wide annular gap between the outer periphery of the piston-like valve body and the inner periphery of the drain valve housing wall containing the middle chamber passage opening.
  • the central chamber passage opening, the drain valve outlet opening and the annular gap surrounding the valve body form the common valve-controlled connection opening between the middle chamber and the drain valve outlet opening, the effective outlet or flow cross section of which increases to the extent that the valve body acts as a result of the differential pressure-dependent control element Discharge opening surrounding annular valve seat lifted, so depending on how far it is from the valve seat and raised past the middle chamber passage opening.
  • the illustrated backflow preventer has a flow housing 1 designed according to FIG. 1, which is installed in a drinking water supply line via its feed line 2 and its discharge line 3.
  • the supply valve 4 is accommodated, which consists of the supply valve body 6 loaded by the spring 5 and the annular valve seat surface 7 surrounding the supply line 2, against which the valve body 6 with its end sealing surface 6 is pressed with considerable pressure.
  • the drain valve 8 which consists of the drain valve body 10 acted upon by the weak spring 9 and the valve seat seal 12 provided in the housing installation part 11.
  • the middle chamber 13 is present in the flow-through housing 1 between the inlet valve 4 and the outlet valve 8. This is connected via the relatively large cross-section through opening 14 to the lower interior 15 of the tubular drain valve housing 16 shown in FIGS. 2 and 3, which is flanged directly to the side of the part of the flow housing 1 containing the central chamber, as shown in particular in FIG. 3 shows.
  • the drain valve housing 16 is essentially tubular. It consists of several cylindrical parts with different diameters, placed one above the other and screwed together. In its upper part it contains the two rolling membranes 18 separated from one another by an intermediate space 17, which form the control element here. The intermediate space 17 is connected to the outside atmosphere via the opening 19. The two rolling membranes 18 are fastened in the middle at the upper end of the control rod 20.
  • the pressurizing chamber 21 arranged above the double membrane or rolling membranes is normally connected to the supply line 2, while the one below the double diaphragm acting chamber 22 through the through hole 23 and the lower valve housing space 15 and the large passage opening 14 with the middle chamber 13 is in constant line connection, so that the lower rolling membrane 18 'is always acted upon by the prevailing liquid pressure in the middle chamber 13.
  • the lower rolling membrane 18 ' is somewhat wider than the upper rolling membrane 18. It is supported in its application force by the control spring 24 arranged in the central region of the control rod 20, which engages on the one hand on the disk 25 fastened to the control rod 20 and on the other hand is supported on the spring support element 26 which rests on an inner shoulder 27 'of the drain valve housing wall 27 .
  • the piston-like valve body 28 is fastened. It has an annular seal 29, by means of which it normally rests in a sealing manner on the annular valve seat surface 30. Below the ring seal 29, a cylindrical part 31, which acts as a damping piston, is also attached to the valve body piston 28 and protrudes into the drain valve outlet opening 32 provided at the lower end of the housing wall 27. A comparatively wide annular gap 33 is present between the outer circumference of the valve body piston 28 and the valve housing wall 27. It ensures that the interior 15 of the drain valve housing 16 is always in sufficient fluid communication with the central chamber 13 connected via the comparatively large passage opening 14.
  • a three-way solenoid valve 34 is provided on the valve housing 16, which can be operated either manually or by remote control.
  • This valve 34 is arranged between the supply line 2 at the point 2 'branching connecting line 35 and the line connection 21' located above the upper loading chamber 21 '. It is also connected via line 36 to the drain valve outlet opening 32 located behind the valve seat 30.
  • the three-way solenoid valve 34 By actuating the three-way solenoid valve 34, the upper loading chamber can 21 are separated from the connecting line 35 leading to the supply line 2 and are connected to the outside atmosphere via the line 36 and the outlet opening 32, as a result of which the valve body piston 28 is raised and thus the outlet opening 32 is opened.
  • the passage opening 14 leading to the middle chamber 13 in the valve housing wall 27 lies laterally immediately above the annular valve seat 30 surrounding the drain valve outlet opening 32 and has a considerably larger opening cross section than the latter.
  • both openings 14, 32 are integrated into a single, relatively large cross-sectional connection opening between the central chamber 13 and the outside atmosphere, which is to be increasingly exposed by the valve body 28 depending on its opening stroke.
  • 4 shows the closed position normally assumed by the drain valve, in which the valve body piston 28 rests on the valve seat ring surface 30, so that the central chamber 13 and the interior 15 of the shut-off valve housing are sealed off from the outside.
  • This position takes the shut-off valve body 28 in the normal flow position of the backflow preventer, that is, when its flow housing 1 is flowed through by the drinking water. If there is no water withdrawal behind the discharge line 3, the inlet valve 4 and the outlet valve 8 close.
  • the relatively strong inlet valve spring 5 ensures that there is a certain minimum pressure difference between the inlet line 2 and the central chamber 13. This causes the control membrane 18, 18 'to remain in the position shown in Figure 2, the drain valve is kept closed.
  • valve body piston 28 is raised even further by the control membranes 18, 18 ', while it drives up past the passage opening 14 leading directly to the middle chamber 13 and thereby exposes this opening continuously, which means that not only the water drain is favored from the middle chamber 13, but at the same time also ventilation takes place via the same openings 14, 32.
  • This case of completely opening the drain valve and thus effective ventilation of the middle chamber 13 can be brought about consciously by actuating the three-way solenoid valve 34, that is to say in connection with the relevant functional test of the drain valve. In this way, the central chamber 13 can be completely emptied of water.
  • control membrane forming the double membrane 18, 18 'can also be replaced by a control piston which can be acted upon on both sides.
  • This could also be designed, for example, as a stepped piston having different diameters at the top and bottom, which is sealingly guided in a cylinder having a correspondingly different diameter, and wherein an intermediate space leading to the outside atmosphere could also be provided between the two diameter regions of the cylinder.

Abstract

Backflow preventers especially suitable for fitting in drinking water pipes have a through-flow housing (1) containing an inlet and an outlet pipe (2 and 3) with a spring-loaded inlet valve (4) inside it and a spring-loaded outlet valve (8) and a central chamber (13) arranged between the two valves (4, 8). When the differential pressure between said central chamber and the inlet pipe (2) dropes below a set minimum, said chamber can be caused to communicate with the outside atmosphere via a discharge valve which then opens, the body (28) of which is connected for this purpose to control components (18, 18') actuatable on one side by the inlet pipe pressure and on the other by the pressure in the central chamber, and can be raised from its outlet valve seat (30), freeing both a water outlet aperture and a ventilating aperture leading to the central chamber (13). In order to obtain an even simpler design for this outlet valve and improved water drainage and ventilation facilities for the central chamber (13), the water outlet aperture of the outlet valve and the ventilation aperture are combined into a single connecting aperture (14, 32) with a relatively large cross-section between the central chamber (13) and the outer atmosphere which can be steplessly opened more widely by the valve body (28) depending on the extent to which it is open.

Description

Die Erfindung bezieht sich auf einen insbesondere zum Einbau in Trinkwasserleitungen bestimmten Rückflußverhinderer, der mit einem eine Zu- und Ableitung enthaltenden Durchflußgehäuse, einem darin untergebrachten federbelasteten Zulaufventil und einem federbelasteten Ablaufventil sowie einer zwischen den beiden Ventilen angeordneten Mittelkammer versehen ist, die mit der Außenatmosphäre über ein bei Unterschreiten eines bestimmten Mindestdifferenzdrucks zwischen Zuleitung und Mittelkammer öffnendes Ablaßventil zu verbinden ist, dessen Ventilkörper mit einem einerseits vom in der Zuleitung und andererseits vom in der Mittelkammer herrschenden Druck beaufschlagbaren Steuerelement verbunden und dadurch von seinem Ablaßventilsitz unter Freigabe sowohl einer Wasseraustrittsöffnung als auch einer darüber liegenden, zur Mittelkammer führenden Belüftungsöffnung nach oben abzuheben ist.The invention relates to a non-return valve, in particular for installation in drinking water pipes, which is provided with a flow housing containing an inlet and outlet, a spring-loaded inlet valve accommodated therein and a spring-loaded outlet valve, and a central chamber arranged between the two valves, which provides the outside atmosphere via A drain valve that opens when the pressure drops below a certain minimum differential pressure between the supply line and the middle chamber is to be connected, the valve body of which is connected to a control element which can be acted upon on the one hand by the pressure prevailing in the supply line and on the other hand by the pressure prevailing in the middle chamber, and thereby by its drain valve seat with the release of both a water outlet opening and one above it ventilation opening leading to the middle chamber is to be lifted off.

Rückflußverhinderer obiger Art sind z.B. durch die DE-A-2 450 465, die EP-A-0 084 754 und die DE-C-28 54 003 bekannt. Sie sorgen dafür, daß der in der Mittelkammer herrschende Flüssigkeitsdruck stets niedriger als der in der Zuleitung vorhandene flüssigkeitsdruck ist, wodurch auch bei etwa schadhaftem oder leckagebehaftetem Zulaufventil ein Rückfluß der Flüssigkeit aus der Mittelkammer oder Ableitung in die Zuleitung verhindert wird. Um beim Öffnen des differenzdruckabhängig arbeitenden Ablaßventils die in der Mittelkammer enthaltene flüssigkeit besser abfließen zu lassen, wird dabei nicht nur eine entsprechende Wasseraustrittsöffnung sondern durch den gleichen Ventilkörper zugleich auch eine zur Mittelkammer führende Belüftungsöffnung freigelegt. Dafür ist bei dem Rückflußverhinderer nach der EU-A-0 084 754 der Ventilkörper als in die Mittelkammer senkrecht eingebautes Ventilkörperrohr ausgebildet, das mit seinem unteren Ende die aus der Mittelkammer unmittelbar in die Außenatmosphäre führende Wasseraustrittsöffnung und mit seinem oberen Ende die zwischen der Mittelkammer und dem Ventilkörperrohrinneren hindurchführende Belüftungszuleitung gelegene Belüftungsöffnung steuert. Ähnliche Verhältnisse liegen bei dem Rückflußverhinderer nach der DE-C-28 54 003 vor, wo der differenzdruckabhängig gesteuerte Ablaßventilkörper gleichfalls als Doppelkörperventil fungiert, in dem er mit seinem unteren Ende die zwischen Mittelkammer und Außenatmosphäre gelegene Wasseraustrittsöffnung und mit seinem oberen Ende die Belüftungsöffnung zwischen Mittelkammer und Außenatmosphäre ventilmäßig steuert. In beiden Fällen erfordert die Doppelventilausbildung des Ablaßventils einen erheblichen baulichen Mehraufwand. Auch sind damit vergrößerte Abdichtungsschwierigkeiten am oberen und unteren Ventilende verbunden. Außerdem hat sich gezeigt, daß das bei den vorbekannten gattungsgemäß ausgebildeten Rückflußverhinderern stets gleichzeitig erfolgende und gleich lang dauernde Öffnen der Wasseraustrittsöffnung einerseits und der Belüftungsöffnung andererseits nicht von Vorteil ist, weil die damit verbundene vergleichsweise häufige Belüftung der Mittelkammer dazu führt, daß diese durch über die Belüftungsluft eingetragene Schmutzstoffe stärker verunreinigt wird.Backflow preventers of the above type are known, for example, from DE-A-2 450 465, EP-A-0 084 754 and DE-C-28 54 003. They ensure that the liquid pressure prevailing in the middle chamber is always lower than the liquid pressure present in the feed line, as a result of which even defective ones or a leaky inlet valve prevents backflow of the liquid from the middle chamber or discharge into the feed line. In order to allow the liquid contained in the central chamber to drain better when the drain valve, which operates as a function of the differential pressure, is opened, not only is a corresponding water outlet opening exposed, but at the same time a ventilation opening leading to the central chamber is also exposed through the same valve body. For the backflow preventer according to EU-A-0 084 754, the valve body is designed as a valve body tube installed vertically in the central chamber, with its lower end the water outlet opening leading directly from the central chamber into the outside atmosphere and with its upper end that between the central chamber and ventilation opening located through the interior of the valve body tube controls ventilation opening. Similar conditions exist for the backflow preventer according to DE-C-28 54 003, where the differential pressure-dependent discharge valve body also functions as a double-body valve, in which the lower end of the water outlet opening located between the central chamber and the outside atmosphere and the upper end of the ventilation opening between the central chamber and controls the outside atmosphere in terms of valves. In both cases, the double valve design of the drain valve requires considerable additional construction work. This also involves increased sealing difficulties at the upper and lower valve ends. In addition, it has been shown that the opening of the water outlet opening on the one hand and the ventilation opening on the one hand and the ventilation opening on the other hand, which always takes place at the same time and has the same duration in the known backflow preventers of the generic type, is not advantageous, because the associated comparatively frequent ventilation of the middle chamber leads to the fact that this is caused by the Ventilation air is contaminated more contaminants.

Der Erfindung liegt daher die Aufgabe zugrunde, einen Rückflußverhinderer der eingangs erwähnten Gattung zu schaffen, der hinsichtlich seines die Mittelkammer mit der Aussenatmosphäre zu verbinden erlaubenden Ablaßventils von einfacherer Bauart ist und für eine gute Entwässerung bei zugleich verbesserter Belüftung der Mittelkammer sorgt.The invention is therefore based on the object of providing a backflow preventer of the type mentioned at the outset, which is simpler in terms of its drain valve which allows the central chamber to be connected to the outside atmosphere It is designed and ensures good drainage with improved ventilation of the middle chamber.

Diese Aufgabe wird ausgehend von einem Rückflußverhinderer der eingangs erwähnten Art erfindungsgemäß dadurch gelöst, daß die Wasseraustrittsöffnung des Ablaßventils und die Belüftungsöffnung zu einer einzigen, einen vergleichsweise großen Querschnitt besitzenden Verbindungsöffnung zwischen Mittelkammer und Außenatmosphäre integriert sind, die durch den Ventilkörper in Abhängigkeit von dessen Öffnungshub kontinuierlich zunehmend freizulegen ist.This object is achieved on the basis of a backflow preventer of the type mentioned at the outset in that the water outlet opening of the drain valve and the ventilation opening are integrated into a single, comparatively large cross-section connecting opening between the central chamber and the outside atmosphere, which is continuously operated by the valve body as a function of its opening stroke is increasingly exposed.

Auf diese Weise kommt man zu einem Rückflußverhinderer, für dessen gelegentlich notwendige Verbindung seiner Mittelkammer mit der Außenatmosphäre nur eine einzige, ventilkörpergesteuerte Verbindungsöffnung notwendig ist, da ihr wirksamer Öffnungsquerschnitt in Abhängigkeit von dem Ventilkörperhub bei dessen jeweiligem Abheben vom Ventilsitz mehr oder weniger weit freigelegt wird, so daß über diese Verbindungsöffnung entsprechend dem jeweiligen Öffnungshub des Ventilkörpers entweder nur Flüssigkeit aus der Mittelkammer abfließen kann oder aber bei größerem Öffnungshub zusätzlich dazu auch eine Belüftung der Mittelkammer erfolgt. Dadurch kann eine unnötige, mit der Einfuhr von Schmutzstoffen behaftete Belüftung der Mittelkammer vermieden und dennoch deren allfällige notwendige Belüftung erreicht werden.In this way, a backflow preventer is obtained, for the occasionally necessary connection of its central chamber to the outside atmosphere, only a single valve body-controlled connection opening is necessary, since its effective opening cross-section is more or less exposed depending on the valve body stroke when it is lifted off the valve seat, so that via this connection opening according to the respective opening stroke of the valve body, either only liquid can flow out of the middle chamber or, in the case of a larger opening stroke, ventilation of the middle chamber also takes place. This avoids unnecessary ventilation of the middle chamber, which is associated with the import of contaminants, and yet the necessary ventilation thereof can be achieved.

In einer besonders vorteilhaften Ausführungsform der Erfindung ist der Rückflußverhinderer mit einem seitlich an seinem Durchflußgehäuse in Höhe seiner Mittelkammer angeflanschten rohrförmigen Ablaßventilgehäuse versehen, das jeweils untereinander das Steuerelement und seine beidseitigen Beaufschlagungskammern, eine Steuerstange mit dem an ihrem unteren Ende sitzenden, kolbenartig ausgebildeten Ventilkörper und die von einem ringförmigen Ventilsitz umgebene Ablaßventil-Austrittsöffnung enthält, wobei unmittelbar oberhalb dieses Ventilsitzes in der Ventilgehäusewand eine unmittelbar zur Mittelkammer führende Durchtrittsöffnung vorgesehen ist, die durch den bei seinem Öffnungshub an ihr vorbei hochfahrenden Ventilkörperkolben zunehmend freizulegen ist und die dadurch zusammen mit der unmittelbar seitlich unter ihr gelegenen Ablaßventil-Austrittsöffnung die integrierte, ventilkörpergesteuerte Verbindungsöffnung bildet. Die zur Mittelkammer führende Durchtrittsöffnung besitzt dafür einen größeren Querschnitt als die unmittelbar unter ihr gelegene Ablaßventil-Austrittsöffnung und zwischen dem Außenumfang des kolbenartigen Ventilkörpers und dem Innenumfang der ihn umgebenden, die Mittelkammer-Durchtrittsöffnung enthaltenden Ablaßventil-Gehäusewandung ist ein breiter Ringspalt vorhanden. Hierdurch bilden die Mittelkammer-Durchtrittsöffnung, die Ablaßventil-Austrittsöffnung und der den Ventilkörper umgebende Ringspalt die gemeinsame ventilgesteuerte Verbindungsöffnung zwischen Mittelkammer und Ablaßventil-Austrittsöffnung, deren wirksamer Austritts bzw. Durchflußquerschnitt sich in dem Maße vergrößert, wie der Ventilkörper durch das differenzdruckabhängig wirkende Steuerelement vom die Abflußöffnung umgebenden ringförmigen Ventilsitz abgehoben, also abhängig davon, wie weit er vom Ventilsitz entfernt und an der Mittelkammer-Durchtrittsöffnung vorbei hochgefahren wird.In a particularly advantageous embodiment of the invention, the backflow preventer is provided with a tubular discharge valve housing flanged to the side of its flow housing at the level of its central chamber, each of which has the control element and its bilateral pressurization chambers, a control rod with the piston-like valve body seated at its lower end, and the like contains an outlet valve outlet opening surrounded by an annular valve seat, a passage opening leading directly to the middle chamber being provided immediately above this valve seat in the valve housing wall, which through the valve body piston moving past it during its opening stroke increasingly expose it is and which thereby forms the integrated, valve body-controlled connection opening together with the drain valve outlet opening located immediately below it. For this purpose, the passage opening leading to the middle chamber has a larger cross-section than the drain valve outlet opening located directly below it and there is a wide annular gap between the outer periphery of the piston-like valve body and the inner periphery of the drain valve housing wall containing the middle chamber passage opening. As a result, the central chamber passage opening, the drain valve outlet opening and the annular gap surrounding the valve body form the common valve-controlled connection opening between the middle chamber and the drain valve outlet opening, the effective outlet or flow cross section of which increases to the extent that the valve body acts as a result of the differential pressure-dependent control element Discharge opening surrounding annular valve seat lifted, so depending on how far it is from the valve seat and raised past the middle chamber passage opening.

Weitere Merkmale der Erfindung sind in den Unteransprüchen gekennzeichnet und werden in der nachfolgenden Figurenbeschreibung erläutert.Further features of the invention are characterized in the subclaims and are explained in the following description of the figures.

In der Zeichnung ist ein vorteilhaftes Ausführungsbeispiel eines erfindungsgemäß gestalteten Rückflußverhinderers dargestellt. Dabei zeigt

  • Fig.1 einen senkrechten Schnitt durch das Durchflußge häuse des Rückflußverhinderers mit daran seitlich angeflanschtem, nur strichpunktiert angedeutetem Abflußventilgehäuse,
  • Fig.2 einen senkrechten Schnitt durch das Abflußventilgehäuse mit zusätzlich angebautem, zur Funktionsprüfung dienendem Dreiwege-Magnetventil,
  • Fig.3 den Rückflußverhinderer in der Seitenansicht, während die
  • Fig.4,5 und 6 einen Teilschnitt entsprechend der Linie A-B der Fig.2 mit in jeweils unterschiedlicher Position befindlichem Ablaßventilkörper wieder geben.
In the drawing, an advantageous embodiment of a check valve designed according to the invention is shown. It shows
  • 1 shows a vertical section through the Durchflußge housing of the backflow preventer with a side-flanged, only dash-dotted drain valve housing,
  • 2 shows a vertical section through the drain valve housing with an additionally attached, three-way solenoid valve used for functional testing,
  • Fig.3 the backflow preventer in side view, while the
  • Figures 4, 5 and 6 give a partial section along the line AB of Figure 2 with the drain valve body in a different position.

Der abgebildete Rückflußverhinderer besitzt ein entsprechend der Fig.1 ausgebildetes Durchflußgehäuse 1, das über seine Zuleitung 2 und seine Ableitung 3 in eine Trinkwasserversorgungsleitung eingebaut wird. Im Durchflußgehäuse 1 ist das Zulaufventil 4 untergebracht, das aus dem durch die Feder 5 belasteten Zulaufventilkörper 6 und der die Zuleitung 2 umgebenden ringförmigen Ventilsitzfläche 7 besteht, gegen die der Ventilkörper 6 mit seiner stirnseitigen Dichtungsfläche 6- mit erheblichem Druck gepreßt wird. Weiterhin befindet sich im Durchflußgehäuse 1 das Ablaufventil 8, das aus dem durch die schwache Feder 9 beaufschlagten Ablaßventilkörper 10 und der im Gehäuseeinbauteil 11 vorgesehenen Ventilsitzdichtung 12 besteht.The illustrated backflow preventer has a flow housing 1 designed according to FIG. 1, which is installed in a drinking water supply line via its feed line 2 and its discharge line 3. In the flow housing 1, the supply valve 4 is accommodated, which consists of the supply valve body 6 loaded by the spring 5 and the annular valve seat surface 7 surrounding the supply line 2, against which the valve body 6 with its end sealing surface 6 is pressed with considerable pressure. Furthermore, in the flow housing 1 there is the drain valve 8, which consists of the drain valve body 10 acted upon by the weak spring 9 and the valve seat seal 12 provided in the housing installation part 11.

Zwischen dem Zulaufventil 4 und dem Ablaufventil 8 ist im Durchflußgehäuse 1 die Mittelkammer 13 vorhanden. Diese ist über die einen verhältnismäßig großen Querschnitt aufweisende Durchtrittsöffnung 14 mit dem unteren Innenraum 15 des in Fig.2 und 3 dargestellten rohrförmigen Ablaßventilgehäuses 16 verbunden, das unmittelbar seitlich an dem die Mittelkammer enthaltenden Teil des Durchflußgehäuses 1 angeflanscht ist, wie das insbesondere die Fig.3 zeigt.The middle chamber 13 is present in the flow-through housing 1 between the inlet valve 4 and the outlet valve 8. This is connected via the relatively large cross-section through opening 14 to the lower interior 15 of the tubular drain valve housing 16 shown in FIGS. 2 and 3, which is flanged directly to the side of the part of the flow housing 1 containing the central chamber, as shown in particular in FIG. 3 shows.

Das Ablaßventilgehäuse 16 ist im wesentlichen rohrförmig gestaltet. Es besteht aus mehreren, im Durchmesser unterschiedlich beschaffenen, übereinander gesetzten und miteinander verschraubten zylindrischen Teilen. Es enthält in seinem oberen Teil die zwei voneinander durch einen Zwischenraum 17 getrennten Rollmembranen 18, die hier das Steuerelement bilden. Der Zwischenraum 17 ist über die Öffnung 19 mit der Außenatmosphäre verbunden. Die beiden Rollmembranen 18 sind am oberen Ende der Steuerstange 20 mittig befestigt. Die oberhalb der Doppelmembran bzw. Rollmembranen angeordnete Beaufschlagungskammer 21 ist normalerweise mit der Zuleitung 2 leitungsmäßig verbunden, während die unterhalb der Doppelmembran liegende Beaufschlagungskammer 22 über die Durchtrittsbohrung 23 und den unteren Ventilgehäuseraum 15 sowie die große Durchtrittsöffnung 14 mit der Mittelkammer 13 in ständiger Leitungsverbindung steht, so daß die untere Rollmembran 18′ stets von dem in der Mittelkammer 13 herrschenden Flüssigkeitsdruck beaufschlagt wird. Dabei ist die untere Rollmembran 18′ noch etwas breitflächiger als die obere Rollmembran 18 ausgebildet. Sie wird in ihrer Beaufschlagungskraft noch durch die im mittleren Bereich der Steuerstange 20 angeordnete Steuerfeder 24 unterstützt, die einerseits an der an der Steuerstange 20 befestigten Scheibe 25 angreift und sich andererseits auf dem Federstützelement 26 abstützt, das an einer Innenschulter 27′ der Ablaßventilgehäusewandung 27 aufliegt.The drain valve housing 16 is essentially tubular. It consists of several cylindrical parts with different diameters, placed one above the other and screwed together. In its upper part it contains the two rolling membranes 18 separated from one another by an intermediate space 17, which form the control element here. The intermediate space 17 is connected to the outside atmosphere via the opening 19. The two rolling membranes 18 are fastened in the middle at the upper end of the control rod 20. The pressurizing chamber 21 arranged above the double membrane or rolling membranes is normally connected to the supply line 2, while the one below the double diaphragm acting chamber 22 through the through hole 23 and the lower valve housing space 15 and the large passage opening 14 with the middle chamber 13 is in constant line connection, so that the lower rolling membrane 18 'is always acted upon by the prevailing liquid pressure in the middle chamber 13. The lower rolling membrane 18 'is somewhat wider than the upper rolling membrane 18. It is supported in its application force by the control spring 24 arranged in the central region of the control rod 20, which engages on the one hand on the disk 25 fastened to the control rod 20 and on the other hand is supported on the spring support element 26 which rests on an inner shoulder 27 'of the drain valve housing wall 27 .

Am unteren Ende der Steuerstange 20 ist der kolbenartig ausgebildete Ventilkörper 28 befestigt. Er besitzt eine Ringdichtung 29, über die er auf der ringförmigen Ventilsitzfläche 30 normalerweise dichtend aufliegt. Unterhalb der Ringdichtung 29 ist am Ventilkörperkolben 28 noch ein als Dämpfungskolben wirkendes zylindrisches Teil 31 befestigt, das in die am unteren Ende der Gehäusewandung 27 vorhandene Ablaßventil-Austrittsöffnung 32 hineinragt. Zwischen dem Außenumfang des Ventilkörperkolbens 28 und der Ventilgehäusewandung 27 ist ein vergleichsweise breiter Ringspalt 33 vorhanden. Er sorgt dafür, daß der Innenraum 15 des Ablaßventilgehäuses 16 in stets ausreichender Flüssigkeitsverbindung mit der über die vergleichsweise große Durchtrittsöffnung 14 verbundenen Mittelkammer 13 steht.At the lower end of the control rod 20, the piston-like valve body 28 is fastened. It has an annular seal 29, by means of which it normally rests in a sealing manner on the annular valve seat surface 30. Below the ring seal 29, a cylindrical part 31, which acts as a damping piston, is also attached to the valve body piston 28 and protrudes into the drain valve outlet opening 32 provided at the lower end of the housing wall 27. A comparatively wide annular gap 33 is present between the outer circumference of the valve body piston 28 and the valve housing wall 27. It ensures that the interior 15 of the drain valve housing 16 is always in sufficient fluid communication with the central chamber 13 connected via the comparatively large passage opening 14.

Um eine allfällige Funktionsprüfung des Ablaßventils vornehmen zu können, ist auf dem Ventilgehäuse 16 ein Dreiwege-Magnetventil 34 vorhanden, das entweder von Hand oder fernbedienbar ist. Dieses Ventil 34 ist zwischen der von der Zuleitung 2 an der Stelle 2′ abzweigenden Anschlußleitung 35 und dem oberhalb der oberen Beaufschlagungskammer 21 gelegenen Leitungsanschluß 21′ angeordnet. Es ist weiterhin über die Leitung 36 mit der hinter dem Ventilsitz 30 gelegenen Ablaßventil-Austrittsöffnung 32 verbunden. Durch Betätigen des Dreiwege-Magnetventils 34 kann die obere Beaufschlagungskammer 21 von der zur Zuleitung 2 führenden Anschlußleitung 35 getrennt und über die Leitung 36 und die Austrittsöffnung 32 mit der Außenatmosphäre verbunden werden, wodurch es zum Anheben des Ventilkörperkolbens 28 und damit zum Öffnen der Austrittsöffnung 32 kommt.In order to be able to carry out a functional test of the drain valve, a three-way solenoid valve 34 is provided on the valve housing 16, which can be operated either manually or by remote control. This valve 34 is arranged between the supply line 2 at the point 2 'branching connecting line 35 and the line connection 21' located above the upper loading chamber 21 '. It is also connected via line 36 to the drain valve outlet opening 32 located behind the valve seat 30. By actuating the three-way solenoid valve 34, the upper loading chamber can 21 are separated from the connecting line 35 leading to the supply line 2 and are connected to the outside atmosphere via the line 36 and the outlet opening 32, as a result of which the valve body piston 28 is raised and thus the outlet opening 32 is opened.

Wie insbesondere die Fig.4 bis 6 zeigen, liegt die zur Mittelkammer 13 führende Durchtrittsöffnung 14 in der Ventilgehäusewandung 27 seitlich unmittelbar oberhalb des die Ablaßventil-Austrittsöffnung 32 umgebenden ringförmigen Ventilsitzes 30 und besitzt einen erheblich größeren Öffnungsquerschnitt als letztere. Beide Öffnungen 14,32 sind im Hinblick auf den sie steuernden kolbenartigen Ventilkörper 28 zu einer einzigen einen vergleichsweise großen Querschnitt besitzenden Verbindungsöffnung zwischen Mittelkammer 13 und der Außenatmosphäre integriert, die durch den Ventilkörper 28 in Abhängigkeit von dessen Öffnungshub kontinuierlich zunehmend freizulegen ist. Hierzu zeigt Fig.4 die vom Ablaßventil normalerweise eingenommene Schließstellung, in der der Ventilkörperkolben 28 auf der Ventilsitzringfläche 30 aufliegt, so daß die Mittelkammer 13 wie auch der Innenraum 15 des Absperrventilgehäuses nach außen abgedichtet sind. Diese Position nimmt der Absperr-Ventilkörper 28 in der normalen Durchflußstellung des Rückflußverhinderers ein, dann also, wenn sein Durchflußgehäuse 1 vom Trinkwasser durchströmt wird. Erfolgt hinter der Ableitung 3 keine Wasserentnahme, so schließen das Zulaufventil 4 und das Ablaufventil 8. Die verhältnismäßig starke Zulaufventilfeder 5 sorgt dabei dafür, daß zwischen der Zuleitung 2 und der Mittelkammer 13 eine bestimmte Mindestdruckdifferenz besteht. Diese bewirkt, daß die Steuermembran 18,18′ in der in Fig.2 dargestellten, das Ablaßventil geschlossen gehaltenen Position verbleibt. Kommt es dagegen, aus welchem Grund auch immer, in der Mittelkammer 13 zu einem Druckanstieg, bei dem die bestimmte Mindestdruckdifferenz zwischen Zuleitung 2 und Mittelkammer 13 unterschritten wird, so reicht der in der Zuleitung 2 und damit auch in der oberen Beaufschlagungskammer 21 herrschende Zuleitungsdruck nicht mehr aus, die Doppelmembran 18,18′ in ihrer unteren Schließposition zu halten. Vielmehr überwiegt dann der auf die untere Rollmembran 18′ überwiegende Beaufschlagungsdruck, so daß die Steuerstange 20 und mit ihr der Ventilkörper 28 angehoben werden. In dessen teilweise angehobener Stellung gemäß Fig.5 kommt es nur zu einem entsprechenden Wasserabfluß durch die nur wenig freigelegte Austrittsöffnung 32 und damit auch zu einer gleichzeitigen entsprechenden Druckerniedrigung in der Mittelkammer 13. Sofern allerdings diese Druckerniedrigung noch nicht ausreichen sollte, um den vorbestimmten SicherheitsMindestdruckunterschied zwischen Zuleitung 2 und Mittelkammer 13 wieder herzustellen, wird der Ventilkörperkolben 28 durch die Steuermembranen 18,18′ noch weiter angehoben, wobei er an der unmittelbar zur Mittelkammer 13 führenden Durchtrittsöffnung 14 vorbei hochfährt und dadurch diese Öffnung kontinuierlich zunehmend freilegt, wodurch nicht allein nur der Wasserablaß aus der Mittelkammer 13 begünstigt wird, sondern zugleich auch über die gleichen Öffnungen 14,32 deren Belüftung erfolgt. Dieser Fall des vollständigen Öffnens des Ablaßventils und damit einer wirksamen Belüftung der Mittelkammer 13 kann bewußt durch Betätigen des Dreiwege-Magnetventils 34 herbeigeführt werden, also in Verbindung mit der diesbezüglichen Funktionsprüfung des Ablaßventils. Auf diese Weise kann die Mittelkammer 13 vollständig von Wasser entleert werden.As shown in FIGS. 4 to 6 in particular, the passage opening 14 leading to the middle chamber 13 in the valve housing wall 27 lies laterally immediately above the annular valve seat 30 surrounding the drain valve outlet opening 32 and has a considerably larger opening cross section than the latter. With regard to the piston-like valve body 28 that controls them, both openings 14, 32 are integrated into a single, relatively large cross-sectional connection opening between the central chamber 13 and the outside atmosphere, which is to be increasingly exposed by the valve body 28 depending on its opening stroke. 4 shows the closed position normally assumed by the drain valve, in which the valve body piston 28 rests on the valve seat ring surface 30, so that the central chamber 13 and the interior 15 of the shut-off valve housing are sealed off from the outside. This position takes the shut-off valve body 28 in the normal flow position of the backflow preventer, that is, when its flow housing 1 is flowed through by the drinking water. If there is no water withdrawal behind the discharge line 3, the inlet valve 4 and the outlet valve 8 close. The relatively strong inlet valve spring 5 ensures that there is a certain minimum pressure difference between the inlet line 2 and the central chamber 13. This causes the control membrane 18, 18 'to remain in the position shown in Figure 2, the drain valve is kept closed. If, on the other hand, for whatever reason, there is a pressure rise in the central chamber 13, which falls below the certain minimum pressure difference between the supply line 2 and the central chamber 13, the supply pressure prevailing in the supply line 2 and thus also in the upper pressurizing chamber 21 is not sufficient more from keeping the double diaphragm 18,18 'in its lower closed position. Rather, it predominates on the lower roller membrane 18 'prevailing pressure, so that the control rod 20 and with it the valve body 28 are raised. In its partially raised position according to FIG. 5, there is only a corresponding water drainage through the only slightly exposed outlet opening 32 and thus also a simultaneous corresponding pressure reduction in the middle chamber 13. Unless, however, this pressure reduction should not suffice by the predetermined minimum safety pressure difference between To restore the supply line 2 and the middle chamber 13, the valve body piston 28 is raised even further by the control membranes 18, 18 ', while it drives up past the passage opening 14 leading directly to the middle chamber 13 and thereby exposes this opening continuously, which means that not only the water drain is favored from the middle chamber 13, but at the same time also ventilation takes place via the same openings 14, 32. This case of completely opening the drain valve and thus effective ventilation of the middle chamber 13 can be brought about consciously by actuating the three-way solenoid valve 34, that is to say in connection with the relevant functional test of the drain valve. In this way, the central chamber 13 can be completely emptied of water.

Im Rahmen der vorliegenden Erfindung sind mancherlei Abänderungen möglich. So kann insbesondere an die Stelle der das Steuerelement bildenden Doppelmembran 18,18′ auch ein entsprechend doppelseitig beaufschlagbarer Steuerkolben treten. Dieser könnte beispielsweise auch als oben und unten verschiedene Durchmesser aufweisender Stufenkolben ausgebildet sein, der in einem entsprechend unterschiedliche Durchmesser besitzenden Zylinder abdichtend geführt ist und wobei zwischen den beiden Durchmesserbereichen des Zylinders auch noch ein zur Außenatmosphäre führender Zwischenraum vorgesehen sein könnte.Various modifications are possible within the scope of the present invention. In particular, the control membrane forming the double membrane 18, 18 'can also be replaced by a control piston which can be acted upon on both sides. This could also be designed, for example, as a stepped piston having different diameters at the top and bottom, which is sealingly guided in a cylinder having a correspondingly different diameter, and wherein an intermediate space leading to the outside atmosphere could also be provided between the two diameter regions of the cylinder.

Claims (7)

  1. Backflow preventer, especially for fitting into drinking water pipes, the backflow preventer having a through-flow housing (1) which contains an inlet pipe (2) and an outlet pipe (3) with a spring-loaded inlet valve (4) inside the through-flow housing (1) and a spring-loaded outlet valve (8) and a central chamber (13) disposed between the two valves (4, 8), the central chamber (13) to be connected to the external atmosphere by means of an outlet valve which opens when the differential pressure between the inlet pipe (2) and the central chamber (13) drops below a set minimum, the body (28) of the outlet valve being connected to the control element (18, 18′) which can be acted upon by pressure on the one side in the inlet pipe and on the other side in the central chamber (13) and in so doing be raised upwards from its outlet valve seat (30), freeing both the water outlet aperture and also a ventilation aperture which lies above a water outlet aperture and leads to the central chamber, characterised in that the water outlet valve outlet aperture and the ventilation aperture are integrated to a single connecting aperture (14, 32) which lies between the central chamber (13) and the external atmosphere and has a comparatively large cross section, the connecting aperture (14, 32) to be continuously further uncovered by the valve body (28) in dependence upon the opening stroke of the valve body (28).
  2. Backflow preventer according to claim 1, characterised in that a pipe-shaped outlet valve housing (16) is flanged laterally on the through-flow housing (1) at the height of its central chamber (13), the outlet valve housing (16) containing in each case below each other a control element (18, 18′) and its pressure-loading chambers (21, 22) on both sides, a control rod (20) with the piston-type valve body (28) located at its lower end and an outlet valve outlet aperture surrounded by an annular valve seat (30) and that a through-flow aperture (14) leading to the central chamber (13) is provided directly above this valve seat (30) in the valve housing wall (27), the through-flow opening (14) to be further uncovered by means of the valve body piston (28) rising past it on its opening stroke and in so doing forming, together with the outlet aperture (32) of the outlet valve lying directly laterally below it, the integrated connecting aperture (14, 32) which is controlled by the valve body.
  3. Backflow preventer according to claim 2, characterised in that the through-flow aperture (14) leading to the central chamber (13) has a larger cross section than the outlet aperture (32) of the outlet valve lying directly below it and there is a wide annular gap between the external periphery of the piston-type valve body (28) and the internal periphery of the outlet valve housing wall surrounding it and containing the central chamber through-flow aperture (14).
  4. Backflow preventer according to one or more of claims 1 to 3, characterised in that a locating control spring (24), which is to raise the valve body (28) from its valve seat surface (30) engages the control rod (20) carrying at its lower end the valve body (28), the control spring (24) supporting itself on a spring supporting element (26) resting on an internal shoulder (27′) of the outlet valve housing wall (27).
  5. Backflow preventer according to one or more of claims 1 to 4, characterised in that the pressure-loading chamber (21) located above the control element (18, 18′) is to be closed off as desired by way of a three-way solenoid valve (34) against the inlet pipe (2) and is to be connected to the outlet aperture (32) of the outlet valve lying behind the annular valve seat (30).
  6. Backflow preventer according to one or more of claims 1 to 5, characterised in that the control element comprises two roller membranes (18, 18′) separated from each other by means of an intermediate chamber (17) connected to the external atmosphere, the roller membrane (18, 18′) being fixedly connected in the centre to the control rod (20) and where the pressure-loading chamber (21), lying above them, is connected to the inlet pipe (2) and the pressure-loading chamber (22), lying below them, is connected to the central chamber (13) by way of the lower outlet valve housing chamber (15), containing the control rod (20), and by way of the through-flow aperture (14) issuing into it laterally.
  7. Backflow preventer according to one or more of claims 1 to 5, characterised in that a control element (18, 18′) is designed as a control piston which can be acted upon by pressure on both sides.
EP90910582A 1989-11-07 1990-07-20 Backflow preventer, especially for fitting in drinking water pipes Expired - Lifetime EP0452426B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90910582T ATE83023T1 (en) 1989-11-07 1990-07-20 BACKFLOW PREVENT, PARTICULARLY FOR INSTALLATION IN DRINKING WATER PIPES.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3936962A DE3936962A1 (en) 1989-11-07 1989-11-07 BACKFLOW PREVENTORS, ESPECIALLY FOR INSTALLATION IN DRINKING WATER PIPES
DE3936962 1989-11-07

Publications (2)

Publication Number Publication Date
EP0452426A1 EP0452426A1 (en) 1991-10-23
EP0452426B1 true EP0452426B1 (en) 1992-12-02

Family

ID=6392991

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90910582A Expired - Lifetime EP0452426B1 (en) 1989-11-07 1990-07-20 Backflow preventer, especially for fitting in drinking water pipes

Country Status (3)

Country Link
EP (1) EP0452426B1 (en)
DE (2) DE3936962A1 (en)
WO (1) WO1991006716A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4409104B4 (en) * 1993-03-20 2004-10-28 Desch, Kurt Michael, Dipl.-Ing. (FH) Hydraulic three-chamber system separator

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH286217A (en) * 1950-07-19 1952-10-15 Benkiser Werk Kommandit Ges Flushing valve with valve body controlled by a counter pressure chamber.
IL45802A (en) * 1973-10-26 1977-05-31 Griswold Controls Check valve useful in backflow prevention apparatus
US4232704A (en) * 1978-03-28 1980-11-11 Amtrol Inc. In line back flow preventer
DE3266453D1 (en) * 1982-01-26 1985-10-31 Socla Back flow preventer for hydraulic conduits

Also Published As

Publication number Publication date
EP0452426A1 (en) 1991-10-23
DE3936962A1 (en) 1991-05-08
WO1991006716A1 (en) 1991-05-16
DE59000553D1 (en) 1993-01-14

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