EP0452426B1 - Dispositif antiretour destine a etre monte en particulier sur les conduites d'eau potable - Google Patents

Dispositif antiretour destine a etre monte en particulier sur les conduites d'eau potable 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
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
EP90910582A
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German (de)
English (en)
Other versions
EP0452426A1 (fr
Inventor
Walter Evers
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.)
Waletzko Armaturen GmbH
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Waletzko Armaturen 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.)
Filing date
Publication date
Application filed by Waletzko Armaturen GmbH filed Critical Waletzko Armaturen GmbH
Priority to AT90910582T priority Critical patent/ATE83023T1/de
Publication of EP0452426A1 publication Critical patent/EP0452426A1/fr
Application granted granted Critical
Publication of EP0452426B1 publication Critical patent/EP0452426B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

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.

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  • 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)

Abstract

Les dispositifs antiretour qui sont destinés en particulier à être montés sur des conduites d'eau potable possèdent un carter de circulation (1) comportant une conduite d'amenée et une conduite de sortie (2 et 3) et à l'intérieur duquel sont disposés un clapet d'amenée à ressort (4) et un clapet de sortie à ressort (8) ainsi qu'une chambre centrale (13) disposée entre les deux clapets (4, 8). Lorsque la différence de pression entre cette chambre et la conduite d'amenée (2) devient inférieure à une valeur minimum déterminée, la chambre peut être reliée à l'atmosphère extérieure grâce à l'ouverture d'un clapet de décharge dont le corps (28) est relié, dans ce but, à un élément de commande (18, 18') pouvant être exposé d'un côté à la pression d'amenée et de l'autre à la pression dans la chambre centrale et pouvant aussi être relevé au-dessus de son siège (30) en libérant à la fois une ouverture pour l'écoulement de l'eau et une ouverture d'aération conduisant à la chambre centrale (13). Pour simplifier encore la construction de ce clapet de décharge tout en améliorant les possibilités d'écoulement de l'eau et d'aération de la chambre centrale (13), l'ouverture d'écoulement de l'eau du clapet de décharge et l'ouverture d'aération sont intégrées à une ouverture de liaison unique (14, 32) de section relativement importante disposée entre la chambre centrale (13) et l'atmosphère extérieure et qui est dégagée progressivement par le corps (28) du clapet en fonction de la course d'ouverture de celui-ci.

Claims (7)

  1. Dispositif anti-retour destiné en particulier à être installé dans des conduites d'eau potable, comprenant un boîtier de passage (1) contenant une conduite d'amenée et une conduite d'évacuation (2 et 3), une soupape d'entrée à commande par ressort (4) et une soupape de sortie à commande par ressort (8) logées dans le boîtier, ainsi qu'une chambre médiane (13) disposée entre les deux soupapes (4, 8), destinée à être reliée à l'atmosphère extérieure par l'intermédiaire d'une soupape de décharge s'ouvrant au-dessous d'une pression différentielle minimale déterminée entre la conduite d'amenée (2) et la chambre médiane (13), dont le corps de soupape (28) est relié à un élément de commande (18, 18′) pouvant être sollicité d'une part par la pression régnant dans la conduite d'amenée (2) et d'autre part par la pression régnant dans la chambre médiane (13) et est destiné de cette manière à être soulevé de son siège de soupape de décharge (30) en dégageant tant un orifice de sortie d'eau qu'un orifice d'aération s'étendant au-dessus de celui-ci et menant à la chambre médiane, caractérisé en ce que l'orifice de sortie d'eau de la soupape de décharge et l'orifice d'aération sont intégrés pour former, entre la chambre médiane (13) et l'atmosphère extérieure, un orifice de liaison unique (14, 32) possédant une section transversale relativement importante et destiné à être dégagé de façon continuellement croissante par le corps de soupape (28) en fonction de la course d'ouverture de celui-ci.
  2. Dispositif anti-retour selon la revendication 1, caractérisé en ce que sur le côté du boîtier de passage (1), à hauteur de sa chambre médiane (13), est flasqué un boîtier de soupape de décharge tubulaire (16) qui contient l'élément de commande (18, 18′) et ses chambres de sollicitation (21, 22) disposées des deux côtés, cet élément et ses chambres étant disposés respectivement l'un au-dessus de l'autre, une tige de commande (20) comportant à son extrémité inférieure le corps de soupape (28) réalisé sous la forme d'un piston et l'orifice de sortie (32) de la soupape de décharge qui est entouré par un siège de soupape annulaire (30), et en ce qu'il est prévu dans la paroi (27) du boîtier de soupape, immédiatement au-dessus de ce siège de soupape (30), un orifice traversant (14) menant directement à la chambre médiane (13), qui est destiné à être dégagé de façon croissante par le piston (28) formé par le corps de soupape lorsqu'il longe ledit orifice en montant pendant sa course d'ouverture et qui constitue de cette manière, avec l'orifice de sortie (32) de la soupape de décharge qui est disposé immédiatement au-dessous de lui sur le côté, l'orifice de liaison intégré (14, 32) commandé par le corps de soupape.
  3. Dispositif anti-retour selon la revendication 2, caractérisé en ce que l'orifice de sortie (14) menant à la chambre médiane (13) possède une section transversale supérieure à celle de l'orifice de sortie (32) de la soupape de décharge qui est disposé immédiatement au-dessous de lui, et en ce qu'un large espace annulaire (33) est prévu entre la périphérie extérieure du corps de soupape (28) en forme de piston et la périphérie intérieure de la paroi (27) du boîtier de soupape de décharge qui l'entoure et qui contient l'orifice traversant (14) de la chambre médiane.
  4. Dispositif anti-retour selon une ou plusieurs des revendications 1 à 3, caractérisé en ce qu'un ressort de commande (24) qui s'appuie sur un élément de support de ressort (26) reposant sur un épaulement intérieur (27′) de la paroi (27) du boîtier de soupape de décharge et qui tend à soulever le corps de soupape (28) de sa surface de siège de soupape (30), agit sur la tige de commande (20) portant le corps de soupape (28) à son extrémité inférieure.
  5. Dispositif anti-retour selon une ou plusieurs des revendications 1 à 4, caractérisé en ce que la chambre de sollicitation (21) disposée au-dessus de l'élément de commande (18, 18′) est destinée, par l'intermédiaire d'une électrovanne à trois voies (34) à être fermée facultativement vis-à-vis de la conduite d'amenée (2) et à être reliée à l'orifice de sortie (32) de la soupape de décharge qui est disposé en arrière du siège de soupape annulaire (30).
  6. Dispositif anti-retour selon une ou plusieurs des revendications 1 à 5, caractérisé en ce que l'élément de commande se compose de deux membranes à rouleaux (18, 18′) séparées l'une de l'autre par un espace intermédiaire (17) relié à l'atmosphère extérieure, qui sont reliées centralement de façon fixe à la tige de commande (20) et par lesquelles la chambre de sollicitation (21) située au-dessus d'elles est reliée à la conduite d'amenée (2) et la chambre de sollicitation (22) située au-dessous d'elles est reliée à la chambre médiane (13) par l'intermédiaire de l'espace de boîtier de soupape de décharge inférieur (15) contenant la tige (20) de commande et de l'orifice traversant (14) qui y débouche latéralement.
  7. Dispositif anti-retour selon une ou plusieurs des revendications 1 à 5, caractérisé en ce que l'élément de commande (18, 18′) est réalisé sous forme d'un piston pouvant être sollicité des deux côtés.
EP90910582A 1989-11-07 1990-07-20 Dispositif antiretour destine a etre monte en particulier sur les conduites d'eau potable Expired - Lifetime EP0452426B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90910582T ATE83023T1 (de) 1989-11-07 1990-07-20 Rueckflussverhinderer, insbesondere zum einbau in trinkwasserleitungen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3936962 1989-11-07
DE3936962A DE3936962A1 (de) 1989-11-07 1989-11-07 Rueckflussverhinderer, insbesondere zum einbau in trinkwasserleitungen

Publications (2)

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

Family

ID=6392991

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90910582A Expired - Lifetime EP0452426B1 (fr) 1989-11-07 1990-07-20 Dispositif antiretour destine a etre monte en particulier sur les conduites d'eau potable

Country Status (3)

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

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4409104B4 (de) * 1993-03-20 2004-10-28 Desch, Kurt Michael, Dipl.-Ing. (FH) Hydraulisches Drei-Kammer-Systemtrenngerät

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH286217A (de) * 1950-07-19 1952-10-15 Benkiser Werk Kommandit Ges Spülventil mit durch Gegendruckkammer gesteuertem Ventilkörper.
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
ATE15822T1 (de) * 1982-01-26 1985-10-15 Socla Rueckflussverhinderer fuer druckleitungen.

Also Published As

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

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