WO1999054563A1 - Vanne de refoulement de citerne - Google Patents

Vanne de refoulement de citerne Download PDF

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Publication number
WO1999054563A1
WO1999054563A1 PCT/GB1999/001053 GB9901053W WO9954563A1 WO 1999054563 A1 WO1999054563 A1 WO 1999054563A1 GB 9901053 W GB9901053 W GB 9901053W WO 9954563 A1 WO9954563 A1 WO 9954563A1
Authority
WO
WIPO (PCT)
Prior art keywords
main valve
valve assembly
upper chamber
outlet
housing
Prior art date
Application number
PCT/GB1999/001053
Other languages
English (en)
Inventor
Douglas Robert David Frost
Original Assignee
Blackborow, John
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
Priority claimed from GBGB9808263.9A external-priority patent/GB9808263D0/en
Application filed by Blackborow, John filed Critical Blackborow, John
Priority to EP99914676A priority Critical patent/EP1073802A1/fr
Priority to AU33402/99A priority patent/AU3340299A/en
Publication of WO1999054563A1 publication Critical patent/WO1999054563A1/fr

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03D—WATER-CLOSETS OR URINALS WITH FLUSHING DEVICES; FLUSHING VALVES THEREFOR
    • E03D1/00—Water flushing devices with cisterns ; Setting up a range of flushing devices or water-closets; Combinations of several flushing devices
    • E03D1/30—Valves for high or low level cisterns; Their arrangement ; Flushing mechanisms in the cistern, optionally with provisions for a pre-or a post- flushing and for cutting off the flushing mechanism in case of leakage
    • E03D1/34—Flushing valves for outlets; Arrangement of outlet valves

Definitions

  • This invention relates to an outlet valve and is primarily intended to provide a quick responding, easily operable fast flowing valve for emptying or partly emptying cisterns and other types of liquid storage containers. It is particularly, although not exclusively, applicable to being used to enable the amount of water used for flushing domestic toilets or W.C.'s to be substantially reduced.
  • the means for achieving the flushing action consists either of a siphon (which at the present for the U. K. is the only device that meets the water byelaws) or one of a number of non-siphon type valves used extensively on the European continent and elsewhere in the world.
  • a siphon which at the present for the U. K. is the only device that meets the water byelaws
  • non-siphon type valves used extensively on the European continent and elsewhere in the world.
  • non-siphon, direct or “flapper” type valves have a valve plate or member which covers and seals the outlet to prevent water from escaping unintentionally.
  • Both the siphon and the direct type valve have a threaded outlet pipe which extends downwards through the bottom of the cistern into which it is fixed by a bulkhead fitting. It is then connected to the toilet pan either directly (close coupled) or by a short length pipe.
  • Non-siphon type valves generally achieve greater flow rates and with the kinetic energy of the water entering the pan approximately doubling for a 50% increase in flow rate, less water is required for achieving an effective flush.
  • the performance of most U. K. toilet pans could be appreciably improved by replacing the siphon with a direct type flush valve and also some existing installations elsewhere could accommodate even higher flow rates than are generally available with existing flush valves.
  • the galleries and contours of the pan to accommodate the higher flow rate and performance of outlet valves of this type, the quantity of water required for effective flushing can be substantially reduced.
  • the higher efficiency of the valve will enable simplification of the pan design e.g. open rim instead of box rim enables wider moulding tolerance and allows considerable cost savings to be achieved in manufacture.
  • An objective of the invention is to enable the amount of water required for effectively flushing W.C.s to be substantially reduced (e.g. for U. K., from 7 to 4 to 4.5 litres full flush.).
  • the invention provides a device for immersion in a fluid in a cistern, which comprises a housing having an upper portion and a lower portion, an upwardly movable main valve assembly within the housing and forming therewith a variable volume upper chamber and lower chamber, a first vent means between the upper chamber and the lower chamber and an outlet leading down from lower housing portion, which portion contains a seat for the main valve assembly at the entry to the outlet so that in the lowered position of the main valve assembly the outlet is blocked against the ingress of fluid in which the device is immersed, a central stem, extending upwardly from the main valve assembly and actuable remotely from the upper housing to raise the main valve assembly of its seat, the wall of the lower portion of the housing having apertures above the seat, whereby on raising the main valve assembly immersion fluid can enter the outlet, the net upward buoyancy force acting on the assembly thereby causing it to rise to the top of the upper chamber and permit full flow of immersion fluid through the outlet and, on its substantially complete discharge, the cessation of flow allowing the main valve assembly to
  • the central upwardly extending stem is preferably a hollow stem protruding above the normal full level of the fluid in the cistern and so provides a convenient and efficient discharge route for fluid to the outlet, should the fluid level rise above the desired normal full level. Thus an overflow route is provided through the outlet.
  • the invention is more specifically described below with reference to a hollow stem although it will be appreciated that this is not essential.
  • the first vent means may conveniently be a restricted passage or pressure balance aperture between the upper and lower chambers.
  • the second vent means through which the fluid is ejected from the upper chamber as the main valve assembly rises may be, for example, an annular ejection port or siphon duct and may additionally include a pressure balance aperture, non-return valve or vent hole to assist fluid flow back into the upper chamber on refilling of the cistern.
  • the actuating device can be made to engage with the hollow stem to enable it and the main valve assembly with which it forms an integral part to move downward sufficiently to cause re-seating or closing of the valve at any level below the full level.
  • the main valve and a hollow stem assembly descend to the seated position (the valve closed) under gravity.
  • the main valve and hollow stem assembly has to be pressed down to the seated position.
  • the immersing fluid for W. C. outlet valves is of course water and the invention will here after be described with reference to water for convenience.
  • Figure 1 shows a part sectional arrangement of a device according to one embodiment of the invention, being a first single flush valve with an interruptible discharge, the valve being in the closed position;
  • Figure 2 shows a variation of Figure 1 of a single flush valve with interruptible discharge, again the valve being in the closed position;
  • Figure 3 shows a sectional arrangement of a third device of the invention, being a single flush valve in the open position; and Figure 4 shows a sectional arrangement of a fourth single flush discharge valve embodiment of the invention, with provision for interruptible discharge, the valve being in the closed position.
  • FIG. 1 shows a cistern outlet/flush valve indicated generally at 1A and sealed by a seal 3 and nut 2 into an outlet at the bottom of a cistern 14.
  • the valve 1A is immersed in water to a set level 25 and the valve is closed with a main seal 5 sealing its outlet base 1 against a seat 33 in a lower portion of the valve housing to prevent the ingress of water from the cistern.
  • the valve housing has an upper chamber 11 , which is filled with water and is in free communication with the water in the cistern via a port 17 and siphon ejection duct 16.
  • the main valve assembly 30, which comprises a piston body 6 and a hollow stem 19, is kept in place by the weight of the assembly and the pressure of water on top of the piston 26.
  • Spaces 3 IB between the supporting pillars 31A above the seat 33 provide communication between the cistern water and water in the lower annular region 32A inside the lower valve housing. As seal 5 is lifted off seat 33, cistern water can therefore discharge through outlet 1, 15.
  • the upper chamber 11 is defined between the extension wall 11A of the upper part of the valve housing, a hollow central boss 28 and the upper surface 26 of the movable valve or piston assembly 30.
  • the main valve assembly 30 moves up and down inside the upper chamber and is sealed by means of seal 7 which remains in contact with the interior of wall 11A.
  • the hollow body 6 of the main valve or piston assembly 30 defines from its upper central region a downwardly extending annular wall 12A which is joined at its lower end to a hollow central stem 19.
  • Stem 19 extends fully through the housing from its lower outlet end 1 to above the water level 25 in the cistern. Between wall 12A and stem 19 is defined an annular pocket 12, whose function is described later.
  • Operation of the valve is achieved initially by lifting the main valve assembly (piston) 30 including its hollow stem off its seat 5, 33. This is carried out by either a lever or pull up knob engaging with a collar 10 attached to hollow stem 19 and raising the said assembly above the valve seat sufficient to allow water to enter and fill the entrance to the outlet 15. When this has taken place, the pressure on the underside of the lower surface of the piston assembly achieves sufficient upward force to overcome the downward forces on the piston and for the piston to start to rise, whilst at the same time ejecting and pushing water from the upper chamber via the tube/duct 16.
  • pressure on top of the piston 26 is at the same pressure as the pressure at the depth of water below the surface 25 and therefore does not increase to the pressure at a depth level with the bottom edge 27 of the siphon/ejection duct (as would be the case if the upper chamber contained air).
  • the said assembly 30 rises to the top of the upper housing 8 displacing the water which is discharged from the bottom edge 27 of duct 16 into the cistern. With the valve fully open, water is discharged through the outlet 1, 15 and into the toilet pan.
  • the main valve assembly (piston) remains in the fully opened position during discharge mainly due to the water pressure underneath the piston being greater than the pressure on top of it.
  • the valve With the cistern filled the valve is ready for use and on lifting the collar 10 to provide the initial part of the opening stroke, the valve will automatically then fully open in the manner described in the foregoing. If it is decided that the full flush is not required, the discharge can be stopped, i.e. interrupted, by closing the valve. This interruption may be achieved by pressing down on the collar 10 and stem 19 to cause the valve to reseat bringing the main seal 5 down onto the valve seat 33. The full downward stroke may be required to achieve this and in the process water readily flows through the ejection duct 16 into the upper chamber 11. With operation of the valve being either a pull up knob or conventional lever, interruption involves 11
  • the water level will continue to rise until it reaches the top edge 34 of the hollow stem 19 and from then on downwards through the hollow stem and into the toilet pan.
  • the hollow stem (overflow) can be made capable of handling the full flow of a failed water inlet valve.
  • Figure 2 shows an arrangement functionally and configurationally similar to Figure 1, in which the ejection duct 16 has a non return valve 18 instead of the vent hole 13.
  • the non return valve gives functionally marginally improved ease of opening and quicker filling of the upper chamber 11 during refilling of the cistern.
  • the valve With the cistern filled to the set level 25, the valve is operated as before by the actuation device (lever or knob) engaging with the collar 10 and hollow stem 19 to raise the main valve and stem assembly (piston) 30, sufficiently for the force due to water pressure underneath the piston to raise the said assembly to the top of the upper housing.
  • Water displaced from the upper chamber 11 both during the initiating lift and due to the buoyancy of the piston during the remainder of the upward stroke is again pushed into the ejection duct 16, but this time some of the water flows through the non return valve 18 and the rest of the water is discharged into the cistern from the bottom of the duct 27 as for Figure 1.
  • air enters the upper chamber and the piston rapidly descends and reseats.
  • FIG. 2 An alternative arrangement of Figure 2 would consist of non return valve 18 being positioned at the base of siphon/ejection duct 16 or a combined siphon ejection duct and non return valve such that the bottom edge of the non return valve was marginally below the piston top 26.
  • the upper chamber 11 With this arrangement and the valve seated the upper chamber 11 would contain air so that on opening the valve (i.e. raising the piston 30) air would be displaced from the upper chamber via port 17, through the siphon/ejection duct and through the non return valve into the water.
  • Refilling would again be similar to that of the valve depicted in Figure 2 except that the water level in the space between the piston and upper housing bore would only rise to a position level with the non return valve which would of course be slightly below the piston top 26, with the piston in the seated position.
  • Figure 3 shows a single flush valve in the fully opened position, which is functionally similar to Figure 1 except that an ejection duct 23 forming an integral part of the upper housing 8 is used instead of the separate ejection duct 16 of Figure 1. Moreover, since the lower edge of the ejection duct 23 is level with the housing flange 31, the piston in the fully raised position overlaps the upper end 24 of the ejection duct 23.
  • the upper chamber 11 contains water and there exists a free communication between the upper chamber and the surrounding cistern via ejection duct 23.
  • valve Operating the valve is achieved in the same way as before by the actuating device engaging with the lift collar 10 and raising the piston assembly 30 sufficiently for it to continue upwards to the top of the housing 8.
  • the actuating device engaging with the lift collar 10 and raising the piston assembly 30 sufficiently for it to continue upwards to the top of the housing 8.
  • water is ejected from the upper chamber via the ejection duct 23 and this continues until the top of the piston 26 and the piston ring 7 approach the narrower upper end 24 of the ejection duct, where upon reaching this point the piston slows down due to throttling action imposed by the restricted path for the water being ejected during the final stages of the upward stroke. Water is ejected through the pressure balance hole 9 and vent 14
  • hole 35 could be eliminated.
  • the pressure balance hole 9 could be made larger to relieve the cushion effect of the air compressed at the top of the housing. Also the height of the ejection duct could be increased to reduce the overlap between the runout of the upper end 24 of duct 23 and piston ring 7. With the upper chamber filled with air, there would be no provision for an interruptible flush. Generally only water filled upper chamber embodiments can be provided with interruptible flush, i.e. Figures 1 and 2.
  • the view again shows a cistern discharge/flush valve fitted at the bottom of a cistern 14 and immersed in water to a set level 25 and the valve closed with the main seal 5, sealing the raised seat rim 33 of outlet 1, 15 to prevent the ingress of water into the outlet.
  • the upper chamber 11 is filled with air and is free to communicate with water in the cistern via the annular pocket or well 12, annular tapered channels/segments 48 (to be described below) and via a more restrictive passage, pressure balance aperture 42 (piston ring gap).
  • Well 12 corresponds to annular pocket 12 of Figure 1 but tapers to a narrower bottom 53 from its wider upper end. Tapered channel 16
  • boss segments 48 are provided inside boss 28 which differs from the corresponding boss in Figure 1 in that in this embodiment the boss tapers inwardly to provide a wider opening 49 between the top of the boss and central stem 19, the opening proceeding via tapering channels 48 to a lower narrow throat 47 above annular opening 46.
  • the piston body 6 and hollow stem 19 assembly are kept in place (i.e. seated) by the weight of the said assembly and the pressure of the water on the piston top 26 and at the bottom 53 of the well 12.
  • the valve is opened by the operating device (either a pull up knob or lever) engaging with trunnion/yoke 44 to raise the main valve assembly 30 (piston 6, hollow stem 19), off the valve seat 33.
  • the well 12 contains water and the level of water in the upper housing 8 is approximately level with the piston top 26.
  • the raising of the piston pushes initially water from the well 12 into the rounded opening 46 at the bottom of the boss 28 and into the narrow annulus (throat) 47.
  • the water then flows through the tapered annular channels 48 and into an annular cup 50 defined by hollow boss 51 at the top of the housing.
  • air from the upper chamber 11 flows via the same passage upwards into the cup 50, where on emerging from the end 49 of the tapered channels, the air expands and erupts upwards through the water.
  • water from the cistern discharges through the apertures 3 IB between supporting pillars 31A and into the outlet 1, 15. 17
  • the tapering of the channel 48 enables the effort required to raise the piston to be reduced and the valve to open rapidly. Moreover the venturi ejector type action, once air is flowing from the upper chamber and the piston is raised sufficiently to provide a substantial upward force, will achieve a pressure at the rounded opening 46 less than the surrounding external water pressure due to head of water and thus the net upward force on the piston/hollow stem assembly 30 is marginally increased.
  • air then can vent, again at a slow rate, through the pressure balance aperture and into the upper chamber to cause the piston to descend at a rate slower than the rate at which the water level in the cistern is falling as it is approaching empty so that the cistern is empty before the piston has descended to the closed position (i.e. reseated with the main seal 5 on seat rim 33).
  • the water level continues to rise until the set level is reached and then the valve is ready for the next use.
  • Interrupting the flush to limit the amount of water discharged can be carried out at any part of the discharge by using the operating device to press down on the trunnion/yoke 44 which causes the piston/hollow stem assembly 30 to move downwards until the valve reseats i.e. main seal 5 seats on rim 33. If the interruption is made almost immediately after opening the valve, as the piston descends it would draw water into the upper chamber 11 via the annular and tapered channels/segments 48 and cup 50. If the level in the cistern falls below the slot 52 before the interruption is carried out, then mainly air is drawn into the upper chamber.
  • the valve as with the other embodiments is provided with an integral overflow. If the water level in the cistern rises above the set level 25 - this being generally due to a leaking inlet valve - the maximum level is limited by the height of the hollow stem/overflow tube. Water reaches the top of the stem 34 and flows down the centre of the stem and into the outlet 1 and into the toilet pan.
  • FIG. 4 There are a number of possible variations to Figure 4.
  • a port 17 and a non return valve 18, similar to those shown in Figure 2 could be incorporated in the top of the upper housing 8.
  • the purpose of the non return valve would be solely for venting the upper chamber; discharging of the chamber during opening of the valve would of course still be substantially through the annular tapered channels 48.
  • a side pocket configurationally similar to the duct 23 of Figure 3, although much smaller, could be incorporated into the side wall of the upper housing 8.
  • This pocket or slot could again extend upwards from the bottom flange 31, but would finish just beyond the outside rim of the piston body containing the piston ring 7 and thus on filling, both air and water would more readily flow via the slot into the upper chamber and thereby partially bypass the pressure balance aperture 42.

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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)
  • Self-Closing Valves And Venting Or Aerating Valves (AREA)

Abstract

L'invention se rapporte à une vanne de citerne perfectionnée, permettant notamment le fonctionnement de la chasse d'eau de W-C. Cette vanne comporte un logement (1A) doté d'une partie supérieure (8) et d'une partie inférieure (31A), et un ensemble principal (30) susceptible de se déplacer vers le haut au sein dudit logement et constituant avec celui-ci une chambre supérieure (11) et une chambre inférieure (32A) à volume variable. La vanne comporte également un premier organe de ventilation (9, 42) disposé entre la chambre supérieure (11) et la chambre inférieure (32A) et une sortie (15) dirigée vers le bas à partir d'une partie inférieure (31A) du logement comportant un siège (33) destiné à l'ensemble principal (30) de la vanne au niveau de l'entrée (1) conduisant à la sortie (15) de sorte qu'en position basse de l'ensemble principal de la vanne, la sortie est bloquée vis à vis de l'entrée de fluide dans lequel le dispositif est immergé. La vanne comporte également une tige centrale (19), orientée vers le haut à partir de l'ensemble principal (30) et susceptible d'être actionnée à distance à partir du logement supérieur (8) de façon à soulever l'ensemble principal (30) de son siège, la paroi de la partie inférieure (31A) du logement ayant des ouvertures (31B) situées au dessus du siège (33). De ce fait, lorsque l'ensemble principal de vanne se soulève, le fluide d'immersion peut pénétrer dans la sortie (15), la force de flottabilité nette vers le haut qui s'exerce sur l'ensemble (30) provoquant alors son soulèvement vers le haut de la chambre supérieure (11) et permettant un écoulement total du fluide d'immersion par la sortie. Lors de sa décharge quasi-totale, l'arrêt de l'écoulement permet à l'ensemble principal de la vanne de reprendre sa position assise. Cette vanne se caractérise en ce qu'un second organe de ventilation (17, 23, 47) est disposé dans la chambre supérieure (11) en vue de l'éjection du fluide à partir de la chambre supérieure grâce au soulèvement de l'ensemble principal (30) de la vanne et en ce que l'air peut pénétrer dans la chambre supérieure par le premier et le second organe de ventilation lors de la descente de l'ensemble principal de la vanne, la partie du logement supérieur (8) comportant une protubérance centrale creuse (28) à travers laquelle la tige centrale (19) est disposée et un renfoncement annulaire (12) est formé sous forme d'évidement limité par une paroi (12A) orientée vers le bas à partir de la surface supérieure (26) de l'ensemble principal et assemblé au niveau de son extrémité inférieure à ladite tige (19), la protubérance (28) se prolongeant dans ledit renfoncement qui joue le rôle de labyrinthe permettant de piéger l'eau.
PCT/GB1999/001053 1998-04-21 1999-04-07 Vanne de refoulement de citerne WO1999054563A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP99914676A EP1073802A1 (fr) 1998-04-21 1999-04-07 Vanne de refoulement de citerne
AU33402/99A AU3340299A (en) 1998-04-21 1999-04-07 Cistern outlet valve

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB9808263.9 1998-04-21
GBGB9808263.9A GB9808263D0 (en) 1998-04-21 1998-04-21 Cistern outlet valve
GB9827101.8 1998-12-10
GBGB9827101.8A GB9827101D0 (en) 1998-04-21 1998-12-10 Interruptable discharge valve

Publications (1)

Publication Number Publication Date
WO1999054563A1 true WO1999054563A1 (fr) 1999-10-28

Family

ID=26313489

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1999/001053 WO1999054563A1 (fr) 1998-04-21 1999-04-07 Vanne de refoulement de citerne

Country Status (4)

Country Link
EP (1) EP1073802A1 (fr)
AU (1) AU3340299A (fr)
GB (1) GB2336605A (fr)
WO (1) WO1999054563A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002001010A1 (fr) 2000-06-27 2002-01-03 Blackborow, John Soupape de decharge double
US7895684B2 (en) 2005-11-07 2011-03-01 Kohler Co. Canister flush valve
CN102933774A (zh) * 2009-09-29 2013-02-13 道格拉斯·罗伯特·戴维·弗罗斯特 双冲洗阀
WO2019070922A1 (fr) * 2017-10-03 2019-04-11 Fluidmaster, Inc. Système et procédé de soupape de refoulement

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5057191B2 (ja) * 2010-09-28 2012-10-24 Ｔｏｔｏ株式会社 排水弁装置、及び、それを備えた洗浄水タンク装置
WO2012043460A1 (fr) * 2010-09-28 2012-04-05 Toto株式会社 Dispositif à soupape de décharge d'eau et dispositif de réservoir de chasse d'eau équipé d'une telle soupape
JP5057190B2 (ja) * 2010-09-28 2012-10-24 Ｔｏｔｏ株式会社 排水弁装置、及び、それを備えた洗浄水タンク装置
JP4941795B1 (ja) * 2011-04-08 2012-05-30 Ｔｏｔｏ株式会社 排水弁装置、及び、それを備えた洗浄水タンク装置
JP5057189B2 (ja) * 2010-09-28 2012-10-24 Ｔｏｔｏ株式会社 排水弁装置、及び、それを備えた洗浄水タンク装置
US9499964B2 (en) 2012-02-22 2016-11-22 Toto Ltd. Flush water supply device, flush water tank assembly with flush water supply device, and flush toilet with flush water tank assembly

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0386539A2 (fr) * 1989-03-07 1990-09-12 Heinrich Menge Chasse d'eau
WO1996014479A1 (fr) * 1994-11-04 1996-05-17 Frost Douglas R D Vanne de vidange
WO1998048121A1 (fr) * 1997-04-24 1998-10-29 Derwent Macdee Limited Vanne de refoulement

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0386539A2 (fr) * 1989-03-07 1990-09-12 Heinrich Menge Chasse d'eau
WO1996014479A1 (fr) * 1994-11-04 1996-05-17 Frost Douglas R D Vanne de vidange
WO1998048121A1 (fr) * 1997-04-24 1998-10-29 Derwent Macdee Limited Vanne de refoulement

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002001010A1 (fr) 2000-06-27 2002-01-03 Blackborow, John Soupape de decharge double
GB2365449A (en) * 2000-06-27 2002-02-20 Frost Douglas R D Dual discharge valve
GB2365449B (en) * 2000-06-27 2004-04-14 Frost Douglas R D Dual discharge valve
US7895684B2 (en) 2005-11-07 2011-03-01 Kohler Co. Canister flush valve
CN102933774A (zh) * 2009-09-29 2013-02-13 道格拉斯·罗伯特·戴维·弗罗斯特 双冲洗阀
CN102933774B (zh) * 2009-09-29 2015-04-01 道格拉斯·罗伯特·戴维·弗罗斯特 双冲洗阀
WO2019070922A1 (fr) * 2017-10-03 2019-04-11 Fluidmaster, Inc. Système et procédé de soupape de refoulement
US10767766B2 (en) 2017-10-03 2020-09-08 Fluidmaster, Inc. Discharge valve system and method
US11391391B2 (en) 2017-10-03 2022-07-19 Fluidmaster, Inc. Discharge valve system and method

Also Published As

Publication number Publication date
EP1073802A1 (fr) 2001-02-07
GB2336605A (en) 1999-10-27
AU3340299A (en) 1999-11-08
GB9907783D0 (en) 1999-06-02

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