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EP0579355A1 - Clapet antiretour - Google Patents

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Publication number
EP0579355A1
EP0579355A1 EP93303083A EP93303083A EP0579355A1 EP 0579355 A1 EP0579355 A1 EP 0579355A1 EP 93303083 A EP93303083 A EP 93303083A EP 93303083 A EP93303083 A EP 93303083A EP 0579355 A1 EP0579355 A1 EP 0579355A1
Authority
EP
European Patent Office
Prior art keywords
valve
disc
moveable
pressure
fluid flow
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP93303083A
Other languages
German (de)
English (en)
Inventor
John Halford
Howard John Lang
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.)
BTG International Ltd
Original Assignee
BTG International Ltd
WRC PLC
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 BTG International Ltd, WRC PLC filed Critical BTG International Ltd
Publication of EP0579355A1 publication Critical patent/EP0579355A1/fr
Withdrawn legal-status Critical Current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
    • E03C1/104—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

  • This invention relates to non-return valves for use in fluid flow systems. More particularly, this invention has been developed to provide improved backflow prevention devices for use in water supply systems and the like, but the devices can also be used in other systems.
  • the present invention provides a self-exercising check valve that actuates in response to flow demand and pressure changes in the fluid supply system.
  • a valve comprising a valve body, a stationary disc positioned in the valve body transverse to fluid flow through the valve body, there being at least one aperture in the stationary disc, and a moveable disc positioned such that one face of the moveable disc closely abuts and is slidable across one face of the stationary disc, wherein the moveable disc has at least one aperture therethrough, the moveable disc being slidable, in response to the difference between a first pressure in the fluid flow on one side of the valve and a second pressure in the fluid flow on the other side of the valve, between a first position in which the at least one aperture of the moveable disc is aligned with the at least one aperture of the stationary disc and a second position in which the apertures are obstructed, and fluid flow is prevented.
  • the moveable disc is operated directly by pressure responsive means, the first pressure being applied to one side of the pressure responsive means, and the second pressure being applied to an opposing side of the pressure responsive means.
  • the pressure responsive means comprises at least one diaphragm.
  • the pressure responsive means comprises a first double diaphragm assembly operably connected to the moveable disc, and a second double diaphragm assembly operably connected to the moveable disc in diametrically opposed relation to the first double diaphragm assembly.
  • the double diaphragm assemblies each provide an air gap for prevention of contamination.
  • the pressure responsive means may comprise differential pistons, or the moveable disc may be rotatably slidable with respect to the stationary disc by means of a rack and pinion arrangement, the rack being provided on the pressure responsive means and the pinion being operable to rotate the moveable disc.
  • the moveable disc is biassed towards the second position in which fluid flow is prevented, such that in the absence of fluid flow the valve closes.
  • the stationary and moveable discs are preferably formed from ceramic material to reduce wear.
  • a stop cock may be provided to manually override the pressure responsive setting of the valve.
  • the disc valve of the first aspect of this invention may be placed in series with a spring-operated check valve or, alternatively, a spring-operated check valve may be incorporated within the valve body. This provides a fail safe device.
  • a relief valve may then be added to the arrangement, to provide a "reduced pressure zone" device.
  • the relief valve preferably comprises a spring-loaded plunger, operably moveable within a branch passage extending from the valve body, one side of the plunger being responsive to pressure on a second side of the disc valve, and the other side of the plunger being responsive to pressure on the first side of the disc valve, between the disc valve and the spring-operated check valve.
  • a valve comprising a valve body, a perforated, substantially conical member supported within the valve body, and a diaphragm adapted to seat within the conical member and comprising a flexible conical skirt, wherein the skirt is moveable to allow fluid to flow in one direction through the valve via the perforations in the conical member, and wherein the skirt seals against the conical member to prevent flow through the valve when the direction of fluid flow is reversed.
  • valve of the second aspect of the present invention may be placed in series with a spring-operated check valve, or such a check valve may be incorporated within the valve body of the invention. This provides a fail safe device.
  • a supply pipe 1 in which the normal direction of fluid flow is as shown by arrow 2.
  • a sliding disc valve 3 in accordance with the first aspect of this invention is placed in the supply pipe 1.
  • a connecting passage or line 4 links a pressure responsive device 5 with the supply pipe upstream of the valve 3, and a connecting passage or line 6 links a further pressure responsive device 7 with the supply pipe downstream of the valve 3.
  • the pressure responsive device 5 incorporates a pressure responsive member which is shown in Figure 1 as a diaphragm 8. One side of the diaphragm 8 is exposed to the pressure in the supply pipe upstream of the valve 3 by means of the connecting line 4, the diaphragm being biassed against the upstream pressure by means of a compression spring 9.
  • the further pressure responsive device 7 incorporates a pressure responsive member which is shown in Figure 1 as a diaphragm 10. One side of the diaphragm 10 is exposed to the pressure in the supply pipe downstream of the valve 3 by means of the connecting line 6.
  • a connecting member 11 connects diaphragm 8 with diaphragm 10, and the connecting member 11 is moveable to actuate means 12 to open and close the valve 3. If there is no flow through the supply pipe, then the spring 9 acts to move means 12 to close the valve 3.
  • the compression spring 9 shown in Figure 1 could be replaced by any other suitable biassing means in either pressure responsive device 5 or pressure responsive device 7.
  • the spring force S will act to close the valve 3.
  • the spring force S and the areas A1 and A2 are selected such that the valve will close before P2 equals P1.
  • the spring force S and the areas A1 and A2 are selected such that the valve will close when the amount by which P1 is greater than P2 drops to about 0.5 to 1 bar.
  • a valve 20 comprises a valve body 21 having a through bore 22 adapted to be connected into a supply line (not shown) such that, when fluid is flowing in the normal direction of supply in the line, the direction of flow in the through bore 22 is as shown by arrow 23.
  • a stationary disc 24 is positioned and held in the through bore transverse to the fluid flow.
  • the disc 24 has a number of apertures 25 therethrough.
  • a moveable disc 26 is supported in sliding face to face abutment with the stationary disc 24, by means of a supporting member 27.
  • the moveable disc has a number of apertures 28 therethrough corresponding to the number of apertures 25.
  • a through passage 29 connects the upstream side of the discs 24, 26 with a chamber 30, and a further through passage 31 connects the downstream side of the discs 24, 26 with a chamber 32.
  • the chamber 30 houses a pressure responsive member which, as shown in Figure 2, comprises two diaphragms 33, 34 separated by an intermediate support 35.
  • the chamber 32 houses a similar pressure responsive member which, as shown in Figure 2, comprises two diaphragms 36, 37 separated by an intermediate support 38.
  • the chamber 32 also houses a spring 39 which acts on the exterior face of the double diaphragm 36, 37 to bias it downwards, as shown in Figure 2.
  • Rods 40, 41 extend from the supporting member 27 and contact the interior faces of the double diaphragms 33, 34 and 36, 37 via heads 42, 43. Accordingly, movement of the diaphragms is transmitted via the rods 40, 41 and the supporting member 27 to the moveable disc 26.
  • the discs 24, 25 are made of a ceramic material so as to be resistant to wear, but any other suitable material may be used.
  • a conventional spring-operated check valve 44 is incorporated within the valve body 21 as a fail safe device and to provide a combination of different check valve devices, thereby reducing the risk of simultaneous failure.
  • the double diaphragms 33, 34 and 36, 37 provide an effective seal between the passages 29 and 31 and the interior faces of the double diaphragms, eliminating the requirement for O-ring seals and the like.
  • the double diaphragms also create an air gap between the two diaphragms and, in particular, an air gap between diaphragms 36 and 37 which acts as a safety means to prevent any contamination of the upstream fluid with the monitored sample of the downstream fluid in passage 31.
  • FIG. 3 The embodiment shown in Figure 3 is substantially the same as that shown in Figure 2, and like numerals have been used for like parts.
  • the double diaphragms used in the Figure 2 embodiment have been replaced by pressure responsive pistons 50 and 51 operably connected to the moveable disc 26, to slide the moveable disc 26 transverse to the stationary disc 24 to open and close the valve in response to a difference in pressure across the valve.
  • Figure 4 the embodiment of Figure 3 has been modified such that the moveable disc 26 is rotatable about its central axis instead of being transversely slidable.
  • the apertures in the moveable disc are rotated into or out of alignment with apertures in the stationary disc.
  • the rotation is achieved by means of a rack and pinion arrangement.
  • the pistons 50 and 51 are connected via a rod 52 on which is provided a rack 53.
  • the rack engages with a pinion 54 such that, as the rack 53 is moved up and down with the rod 52 in response to pressure differences across the valve, the pinion 54 is rotated.
  • a gear 55 is fixed to the pinion to rotate with the pinion, and the gear 55 engages a toothed edge 56 on the moveable disc 26.
  • the disc 26 is thus rotated in response to pressure difference across the valve.
  • a manually operated stop cock may optionally be incorporated in any of the valves shown in Figures 2 to 4, such that the position of the moveable disc can be set manually by overriding the pressure responsive setting of the valve.
  • Figure 5 shows a fluid supply line 80 in which the normal direction of fluid flow is shown by arrow 81.
  • a sliding disc valve in accordance with any of the embodiments shown in Figures 2 to 4 is fitted in the supply line 80, and is shown diagrammatically at 82 in Figure 5.
  • a conventional spring-operated check valve is also provided in the supply line downstream of the sliding disc valve 82.
  • a relief valve shown generally at 83 is fitted to one side of the supply line.
  • the relief valve has a valve body 85, and an aperture 84 in the supply line connects the fluid flow through the supply line with a branch passage 86 through the body 85 of the relief valve.
  • the aperture 84 lies between the disc valve 82 and the check valve 44.
  • a further aperture 87 is formed in the side of the supply line upstream of the disc valve 82.
  • the aperture 87 connects with a through passage 88 in the relief valve body.
  • the relief valve body incorporates an outlet passage 89, and a valve member 90 is movable between a first position (shown in Figure 5) in which the branch passage 86 is shut off from the outlet passage 89, and a second position in which the branch passage 86 connects with the outlet passage 89 to allow fluid flow in the direction of arrow 91.
  • the valve member 90 comprises a plunger 92 having at one end a head 93 adapted to close the opening between the branch passage 86 and the outlet passage 89. The other end of the plunger is connected to one side of a pressure responsive member such as a diaphragm 94.
  • the plunger 92 is biassed to the second, open position by means of a spring such as a compression spring 95.
  • the other side of the diaphragm 94 is exposed to the pressure upstream of the sliding disc valve 82 by means of aperture 87 and through passage 88.
  • the spring 95 forces the plunger 92 of the relief valve to open, connecting the branch passage 86 with the outlet passage 89, creating a reduced pressure region 95 and allowing the fluid to drain from the region 95 between the disc valve 82 and the check valve 44.
  • the disc valve 82 and the check valve 44 are closed. Accordingly, once the fluid has drained through outlet passage 89, a safety airgap is produced in the region 95 between the potential contaminant and the fluid supply.
  • the relief valve 83 may be bolted on to the supply line, or connected in any other suitable way.
  • FIG. 6 shows a valve 60 in accordance with the second aspect of the invention, fitted between a manifold 61 and a meter 62.
  • the valve comprises a valve body 63 having an annular inlet passage 64 separated from a central outlet passage 65, by means of a sleeve 66.
  • a frusto-conical member 67 made preferably of metal is supported within the sleeve by any suitable arrangement.
  • the sleeve 66 is formed from an upper portion 68 and a lower portion 69, and a flange 70 on the member 67 is clamped between the upper and lower portions of the sleeve.
  • the frusto-conical member 67 thus lies in the flow through the outlet passage 65, and the taper of the frusto-conical member expands outwardly in the normal direction of flow through the outlet passage.
  • a number of perforations 71 are provided in the frusto-conical member 67.
  • a flexible diaphragm 72 made of an elastomeric material such as rubber, and having a frusto-conical skirt 73, is seated within the member 67.
  • the skirt 73 When fluid flows in the normal direction through the valve (as shown by the arrows), the skirt 73 is lifted away from the member 67 by fluid passing through the perforations 71 and the fluid can flow readily through the valve.
  • the fluid pressure expands the skirt 73 to seal against the member 67 and prevent reverse flow through the valve.
  • a conventional spring-operated check valve 74 is also incorporated within the valve body 63 for additional safety.
  • the embodiment shown in Figure 6 has the advantage that it can be added to existing domestic installations without difficulty and without significant alterations to the existing installations being required. It is particularly useful as a non-return valve for connecting a domestic water meter to a supply manifold.
  • valves of the present invention may be used in any other areas of fluid flow control, where non-return valves are required.

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Safety Valves (AREA)
  • Check Valves (AREA)
EP93303083A 1992-04-21 1993-04-21 Clapet antiretour Withdrawn EP0579355A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9208542 1992-04-21
GB9208542A GB9208542D0 (en) 1992-04-21 1992-04-21 Non-return valves

Publications (1)

Publication Number Publication Date
EP0579355A1 true EP0579355A1 (fr) 1994-01-19

Family

ID=10714256

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93303083A Withdrawn EP0579355A1 (fr) 1992-04-21 1993-04-21 Clapet antiretour

Country Status (2)

Country Link
EP (1) EP0579355A1 (fr)
GB (1) GB9208542D0 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0860558A1 (fr) * 1997-02-19 1998-08-26 A.T. Avanzata Tecnologia S.R.L. Système d'alimentation de fluide d'un réseau à un utilisateur, avec séparation de fluide et pressurisation du fluide de l'utilisateur utilisant la pression de réseau
WO2008012095A1 (fr) * 2006-07-27 2008-01-31 Erwin Weh Soupape de commande à coulisseau

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE218988C (fr) *
GB586166A (en) * 1943-06-22 1947-03-10 Frank Carlton Back siphonage prevention, anti-backflow and vacuum breaking valve and method of operation
US2417357A (en) * 1941-06-04 1947-03-11 Clayton Manufacturing Co Antisiphon valve
FR1310784A (fr) * 1961-11-20 1962-11-30 Ferch & Nabben Dispositif pour empêcher la réaspiration des liquides dans les canalisations tubulaires
US3955591A (en) * 1975-03-05 1976-05-11 Baumann Hans D Insert type sliding gate valve
EP0351319A1 (fr) * 1988-07-15 1990-01-17 Socla Organe de commande pour fluide et appareil de protection contre les retours de fluide le comportant

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE218988C (fr) *
US2417357A (en) * 1941-06-04 1947-03-11 Clayton Manufacturing Co Antisiphon valve
GB586166A (en) * 1943-06-22 1947-03-10 Frank Carlton Back siphonage prevention, anti-backflow and vacuum breaking valve and method of operation
FR1310784A (fr) * 1961-11-20 1962-11-30 Ferch & Nabben Dispositif pour empêcher la réaspiration des liquides dans les canalisations tubulaires
US3955591A (en) * 1975-03-05 1976-05-11 Baumann Hans D Insert type sliding gate valve
EP0351319A1 (fr) * 1988-07-15 1990-01-17 Socla Organe de commande pour fluide et appareil de protection contre les retours de fluide le comportant

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0860558A1 (fr) * 1997-02-19 1998-08-26 A.T. Avanzata Tecnologia S.R.L. Système d'alimentation de fluide d'un réseau à un utilisateur, avec séparation de fluide et pressurisation du fluide de l'utilisateur utilisant la pression de réseau
WO2008012095A1 (fr) * 2006-07-27 2008-01-31 Erwin Weh Soupape de commande à coulisseau
US8286662B2 (en) 2006-07-27 2012-10-16 Erwin Weh Switching valve with slider

Also Published As

Publication number Publication date
GB9208542D0 (en) 1992-06-03

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19940718

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Effective date: 19971223