US3455324A - Apparatus for preventing return-flow of liquid from a receptacle supplied under pressure by a supply network back into the latter - Google Patents

Apparatus for preventing return-flow of liquid from a receptacle supplied under pressure by a supply network back into the latter Download PDF

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US3455324A
US3455324A US3455324DA US3455324A US 3455324 A US3455324 A US 3455324A US 3455324D A US3455324D A US 3455324DA US 3455324 A US3455324 A US 3455324A
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supply network
liquid
nozzle
flow
diffuser
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Rudolf Bieri
Hans Bieri
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SUSTEN ANSTALT
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SUSTEN ANSTALT
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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
    • E03C1/102—Devices for preventing contamination of drinking-water pipes, e.g. means for aerating self-closing flushing valves using an air gap device
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03D—WATER-CLOSETS OR URINALS WITH FLUSHING DEVICES; FLUSHING VALVES THEREFOR
    • E03D5/00—Special constructions of flushing devices, e.g. closed flushing system
    • E03D5/02—Special constructions of flushing devices, e.g. closed flushing system operated mechanically or hydraulically (or pneumatically) also details such as push buttons, levers and pull-card therefor
    • E03D5/026—Devices preventing overflow or locks inhibiting the use of the flushing system ; Devices preventing sucking-up of sealing and flushing water
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03D—WATER-CLOSETS OR URINALS WITH FLUSHING DEVICES; FLUSHING VALVES THEREFOR
    • E03D9/00—Sanitary or other accessories for lavatories ; Devices for cleaning or disinfecting the toilet room or the toilet bowl; Devices for eliminating smells
    • E03D9/08—Devices in the bowl producing upwardly-directed sprays; Modifications of the bowl for use with such devices ; Bidets; Combinations of bowls with urinals or bidets; Hot-air or other devices mounted in or on the bowl, urinal or bidet for cleaning or disinfecting
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/3149—Back flow prevention by vacuum breaking [e.g., anti-siphon devices]
    • Y10T137/3185—Air vent in liquid flow line

Definitions

  • the subject invention comprises a nozzle and a diffuser, the nozzle and diffuser being substantially axially aligned and cooperating with one another to provide therebetween a free space communicating with the atmosphere, the diffuser having a smaller flow capacity than the nozzle.
  • the present invention has reference to an improved method for preventing the return-flow of liquid from a receptacle or tank supplied under pressure by a supply network back into the supply network upon the appearance of an underpressure at the latter and improved apparatus for the performance of the aforesaid method.
  • a further important object of this invention has reference to an improved method of, and apparatus for effectively preventing return-flow from a receptacle or the like back into a supply network upon appearance of an underpressure at the latter, wherein the apparatus is relatively simple and compact in construction, economical to manufacture, highly reliable in operation, and does not require any great maintenance or servicing.
  • Still another important object of this invention has reference to an improved method and apparatus for effectively preventing undesired return-flow of a liquid, particularly in connection with sanitary installations, which is foolproof in operation and easy to install at existing sanitary systems.
  • the method of the present invention for preventing the return-flow of liquid from a receptacle supplied under pressure by a supply network back into the latter upon the appearance of an underpressure in such supply network is characterized by the features that the pressure energy of the liquid coming from the supply network is transformed in a nozzle into at least approximately pure kinetic energy', thereafter the liquid stream or jet is communicated with atmospheric pressure or the atmosphere along a path which is above the highest possible liquid level in the receptacle, and thereafter at least a portion of the liquid stream is conducted into a diffuser where the kinetic energy thereof is at least partially again transformed back into pressure energy.
  • the present invention also pertains to an improved apparatus for carrying out the aforementioned method which incorporates a nozzle and a diffuser. More specifically, both said nozzle and diffuser are axially aligned and they cooperate with one another such as to provide therebetween a free space which communicates with atmosphere, and the liquid stream flowing from the nozzle to the diffuser freely traverses such free space and thus also communicates with atmosphere.
  • the inventive apparatus structure is particularly useful for separating the water infeed for sanitary installations from the supply network, especially for use with spray devices for washing the lower regions of the body, bidets, lavatory flushing installations and the like.
  • the depicted embodiment of apparatus can be used to advantage with any suitable sanitary installation in order to prevent return-flow of water, for instance from a non-illustrated receptacle back into a non-illustrated supply network upon the appearance of an underpressure at the supply network, as such might be caused if a conduit thereof ruptured.
  • the water coming from the non-illustrated supply network under pressure is delivered via the connecting nipple or pipe stud 1 through a curved conduit 2 to the nozzle 3 which is shown to converge from its inlet end 15 towards the discharge end 11 thereof and is capable of converting pressure energy into kinetic energy in the usual manner.
  • Both the conduit 2 and the nozzle 3 are located within a hollow housing 6.
  • this nozzle 3 has a threaded portion 9 engaging with a complementary threaded portion 10 of a diffuser 4 which is also at least partially located within the hollow housing 6.
  • Nozzle 3 and diffuser 4 are aligned with one another and the discharge end or outlet 11 of the nozzle 3 is spaced from the inlet 12 of the diffuser 4 to provide therebetween a free path or space 13 which communicates with atmosphere, as will be explained shortly, and through which freely traverses the stream or jet of water when moving from the nozzle 3 into the diffuser 4.
  • the pressure energy of the water coming from the supply network is at least approximately transformed into pure kinetic energy, and then such water stream is brought into communication with the atmosphere along a short path, namely when traversing the free space 13, and thereafter is at least partially conducted into the diffuser 4 where the kinetic energy of the water jet or stream is again at least partially transformed into pressure energy.
  • the nozzle and diffuser could be completely spaced from one another, could also even be formed in a Q common member. What is important is that they cooperate with one another to provide a free space or path communicating with atmosphere therebtween, specifically between the discharge end of nozzle and inlet of diffuser.
  • the ditfuser 4 in the illustrated embodiment, is designed in such a manner that only about 70% to 90%, and here assumed to be 85%, of the quantity of Water flowing through the infeed conduit 2 and the nozzle 3 flows through the aforesaid diffuser 4.
  • the ditfuser 4 is designed in such a manner that only about 70% to 90%, and here assumed to be 85%, of the quantity of Water flowing through the infeed conduit 2 and the nozzle 3 flows through the aforesaid diffuser 4.
  • At least one overflow bore 7 at the housing 6 which is located beneath the discharge opening 11 of the nozzle 3 yet above the highest point of the drain channel 5, and which prevents that in the event of any possible clogging of the discharge or drain channel 5, the free path or space 13 between the nozzle 3 and the diffuser 4 is not submerged in water and thus if there is any eventual rupture of a pipe of the water supply network, feces or other waste matter, for instance from a closet bowl cannot be sucked up.
  • the slot 8 provided at the housing 6 serves to ensure that the inner compartment 14 thereof in which the entire apparatusis arranged is always under atmospheric pressure, in other words, that the free space 13 communicates with atmosphere, so that no return-flow is possible.
  • Apparatus for preventing the return-flow of liquid from a receptacle supplied under pressure by a supply network back into the supply network upon the appearance of an underpressure in the latter comprising a nozzle and a diffuser, said nozzle and diffuser being substantially axially aligned and cooperating with one another to provide therebetween a free space communicating with atmosphere, the liquid stream flowing from the nozzle to said diffuser freely traversing said free space and communicating with atmosphere, said diffuser having a flow capacity smaller than the flow capacity of said nozzle such that only a portion of the liquid stream delivered from said nozzle can flow through said diffuser, and drain means for draining the excess liquid comprising the remaining portion of the liqund stream delivered from said nozzle.
  • Apparatus as defined in claim 1 further including a hollow housing in which said nozzle and difiuser are mounted, means provided at said hollow housing for communicating the interior of the latter and said free space with atmosphere.
  • drain means incorporates at least one discharge channel at the lower region of said hollow housing and at least one overflow bore located above said discharge channel.

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  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Water Supply & Treatment (AREA)
  • Molecular Biology (AREA)
  • Epidemiology (AREA)
  • Mechanical Engineering (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Bidet-Like Cleaning Device And Other Flush Toilet Accessories (AREA)

Description

v 3,455,324 APPARATUS FOR PREVENTING RETURN-FLOW OF LIQUID FROM July 15 1969 R. BIERI ETAL A RECEPTAGLE SUPPLIED UNDER PRESSURE BY A SUPPLY NETWORK BACK INTO THE LA'I'TER Filed April 8. 1966 INVENTORS Rmolf? BiER BY Hans 'Bfun United States Patent Office 3,455,324 Patented July 15, 1969 3,455,324 APPARATUS FOR PREVENTING RETURN-FLOW OF LIQUID FROM A RECEPTACLE SUPPLIED UNDER PRESSURE BY A SUPPLY NETWORK BACK INTO THE LATTER Rudolf Bieri, Winterthur, and Hans Bieri, Pfalfikon, Zurich, Switzerland, assignors to Susten-Anstalt, Vaduz, Liechtenstein, a corporation of Liechtenstein Filed Apr. 8, 1966, Ser. No. 541,279 Claims priority, application Switzerland, Apr. 14, 1965,
5,215/65 Int. Cl. E03c 1/10 1. US. Cl. 137-216 7 Claims ABSTRACT OF THE DISCLOSURE A method and apparatus is disclosed for preventing the return-flow of liquid from a receptacle or. tank supplied under pressure by a supply network. The subject invention serves to transform the pressure energy of the incoming liquid from the supply network into approximately pure kinetic energy in the form of a liquid stream or jet, this liquid stream or jet communicating with atmospheric pressure and, thereafter, at least a portion of the liquid stream being at least partially transformed back into pressure energy. In one form, the subject invention comprises a nozzle and a diffuser, the nozzle and diffuser being substantially axially aligned and cooperating with one another to provide therebetween a free space communicating with the atmosphere, the diffuser having a smaller flow capacity than the nozzle.
The present invention has reference to an improved method for preventing the return-flow of liquid from a receptacle or tank supplied under pressure by a supply network back into the supply network upon the appearance of an underpressure at the latter and improved apparatus for the performance of the aforesaid method.
A number of different methods and apparatuses are already known to the art for the purpose of preventing return-flow of liquid from a receptacle or container supplied under pressure by a supply network back into the latter upon the appearance of an underpressure at such supply network. Thus, for instance, in lavatory flushing installations or spray apparatus for washing the lower regions of the body there have been employed either flushing tanks or pumps which, among other things, should prevent that upon rupture of a conduit of the supply network, wherein there can appear a vacuum and thus return-flow, feces or other waste material is sucked back into the supply network. However, the use of a flushing cabinet or tank requires a great deal of space and a pump is expensive in both cost and maintenance.
Accordingly, it is a primary object of the present invention to effectively overcome the aforementioned disadvantages of the prior art.
A further important object of this invention has reference to an improved method of, and apparatus for effectively preventing return-flow from a receptacle or the like back into a supply network upon appearance of an underpressure at the latter, wherein the apparatus is relatively simple and compact in construction, economical to manufacture, highly reliable in operation, and does not require any great maintenance or servicing.
Still another important object of this invention has reference to an improved method and apparatus for effectively preventing undesired return-flow of a liquid, particularly in connection with sanitary installations, which is foolproof in operation and easy to install at existing sanitary systems.
The method of the present invention for preventing the return-flow of liquid from a receptacle supplied under pressure by a supply network back into the latter upon the appearance of an underpressure in such supply network is characterized by the features that the pressure energy of the liquid coming from the supply network is transformed in a nozzle into at least approximately pure kinetic energy', thereafter the liquid stream or jet is communicated with atmospheric pressure or the atmosphere along a path which is above the highest possible liquid level in the receptacle, and thereafter at least a portion of the liquid stream is conducted into a diffuser where the kinetic energy thereof is at least partially again transformed back into pressure energy.
The present invention also pertains to an improved apparatus for carrying out the aforementioned method which incorporates a nozzle and a diffuser. More specifically, both said nozzle and diffuser are axially aligned and they cooperate with one another such as to provide therebetween a free space which communicates with atmosphere, and the liquid stream flowing from the nozzle to the diffuser freely traverses such free space and thus also communicates with atmosphere.
The inventive apparatus structure is particularly useful for separating the water infeed for sanitary installations from the supply network, especially for use with spray devices for washing the lower regions of the body, bidets, lavatory flushing installations and the like.
Other features, objects and advantages of the invention will become more readily apparent by reference to the following detailed description and the single figure of the drawing which depicts an exemplary, preferred embodiment of inventive apparatus.
The depicted embodiment of apparatus can be used to advantage with any suitable sanitary installation in order to prevent return-flow of water, for instance from a non-illustrated receptacle back into a non-illustrated supply network upon the appearance of an underpressure at the supply network, as such might be caused if a conduit thereof ruptured.
Insofar as actual physical structure of the apparatus is concerned, it will be understood that the water coming from the non-illustrated supply network under pressure is delivered via the connecting nipple or pipe stud 1 through a curved conduit 2 to the nozzle 3 which is shown to converge from its inlet end 15 towards the discharge end 11 thereof and is capable of converting pressure energy into kinetic energy in the usual manner. Both the conduit 2 and the nozzle 3 are located within a hollow housing 6. In the exemplary embodiment this nozzle 3 has a threaded portion 9 engaging with a complementary threaded portion 10 of a diffuser 4 which is also at least partially located within the hollow housing 6. Nozzle 3 and diffuser 4 are aligned with one another and the discharge end or outlet 11 of the nozzle 3 is spaced from the inlet 12 of the diffuser 4 to provide therebetween a free path or space 13 which communicates with atmosphere, as will be explained shortly, and through which freely traverses the stream or jet of water when moving from the nozzle 3 into the diffuser 4.
It will be appreciated that in the nozzle 3 the pressure energy of the water coming from the supply network is at least approximately transformed into pure kinetic energy, and then such water stream is brought into communication with the atmosphere along a short path, namely when traversing the free space 13, and thereafter is at least partially conducted into the diffuser 4 where the kinetic energy of the water jet or stream is again at least partially transformed into pressure energy. Of course, the nozzle and diffuser could be completely spaced from one another, could also even be formed in a Q common member. What is important is that they cooperate with one another to provide a free space or path communicating with atmosphere therebtween, specifically between the discharge end of nozzle and inlet of diffuser.
Moreover, the ditfuser 4, in the illustrated embodiment, is designed in such a manner that only about 70% to 90%, and here assumed to be 85%, of the quantity of Water flowing through the infeed conduit 2 and the nozzle 3 flows through the aforesaid diffuser 4. By virtue of this measure, there is positively prevented that air is sucked into the diffuser 4, which is often-times undesirable. The excess water is withdrawn by .a drain channel or conduit 5 located beneath the inlet openinglZ of the diffuser 4. As an additional security measure there is provided at least one overflow bore 7 at the housing 6 which is located beneath the discharge opening 11 of the nozzle 3 yet above the highest point of the drain channel 5, and which prevents that in the event of any possible clogging of the discharge or drain channel 5, the free path or space 13 between the nozzle 3 and the diffuser 4 is not submerged in water and thus if there is any eventual rupture of a pipe of the water supply network, feces or other waste matter, for instance from a closet bowl cannot be sucked up. The slot 8 provided at the housing 6 serves to ensure that the inner compartment 14 thereof in which the entire apparatusis arranged is always under atmospheric pressure, in other words, that the free space 13 communicates with atmosphere, so that no return-flow is possible. Not only is the free space 13 above the highest level of water in the housing 6 but it is also above the highest possible level of the water in the non-illustrated receptacle to which the water jet or stream emanating from the discharge end 16 of the difiuser 4 is delivered via the pipe or conduit 17.
While there is shown and described a present preferred embodiment of the invention it is to be distinctly understood that the invention is not limited thereto but may be otherwise variously embodied and practiced.
What is claimed is:
1. Apparatus for preventing the return-flow of liquid from a receptacle supplied under pressure by a supply network back into the supply network upon the appearance of an underpressure in the latter, said apparatus comprising a nozzle and a diffuser, said nozzle and diffuser being substantially axially aligned and cooperating with one another to provide therebetween a free space communicating with atmosphere, the liquid stream flowing from the nozzle to said diffuser freely traversing said free space and communicating with atmosphere, said diffuser having a flow capacity smaller than the flow capacity of said nozzle such that only a portion of the liquid stream delivered from said nozzle can flow through said diffuser, and drain means for draining the excess liquid comprising the remaining portion of the liqund stream delivered from said nozzle.
2. Apparatus as defined in claim 1, wherein said nozzle has an inlet end and a discharge end, said diffuser having an inlet end and a discharge end, the discharge end of said nozzle and the inlet end of said diffuser being spaced from one another to provide therebetween said free space.
3. Apparatus as defined in claim 2, wherein said nozzle converges from its inlet end to its discharge end.
4. Apparatus as defined in claim 1 wherein said flow capacity of said diffuser is such that to of the quantity of liquid delivered to said nozzle flows through said diffuser.
5. Apparatus as defined in claim 1, further including a hollow housing in which said nozzle and difiuser are mounted, means provided at said hollow housing for communicating the interior of the latter and said free space with atmosphere.
6. Apparatus as defined in claim 5, wherein said hollow housing is provided with said drain means positioned beneath said free space to ensure that the highest level of the liquid which may collect in the hollow housing is below said free space so that the latter continually communicates with atmosphere.
7. Apparatus as defined in claim 6, wherein said drain means incorporates at least one discharge channel at the lower region of said hollow housing and at least one overflow bore located above said discharge channel.
References Cited UNITED STATES PATENTS 1,830,955 11/1931 Moseley 137-216 X 2,056,357 10/1936 Luff 137-216 2,287,534 6/1942 Powers 137-216 3,072,137 1/1963 McDougall 137-216 3,155,106 11/1964 Baron 137-216 3,183,923 5/1965 Henrikson 137-216 WILLIAM F. ODEA, Primary Examiner DENNIS H. LAMBERT, Assistant Examiner
US3455324D 1965-04-14 1966-04-08 Apparatus for preventing return-flow of liquid from a receptacle supplied under pressure by a supply network back into the latter Expired - Lifetime US3455324A (en)

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CH521565A CH444076A (en) 1965-04-14 1965-04-14 Device for preventing liquid from being sucked back from a container fed under pressure by a feed network into the feed network

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Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3620241A (en) * 1970-08-03 1971-11-16 Desalination Systems Combination plumbing fixture for water purification system having waste bypass flow
US3747643A (en) * 1969-07-17 1973-07-24 Bowles Eng Corp Fluidically controlled siphon
US4340340A (en) * 1980-12-18 1982-07-20 Plastic Machinery Corporation Vacuum system
US4454891A (en) * 1982-03-09 1984-06-19 Emerson Electric Co. (H & H Precision Products Division) Air gap drain module for use in a reverse osmosis system
US4834132A (en) * 1986-09-25 1989-05-30 Nissan Motor Company, Limited Fuel transfer apparatus
US4838307A (en) * 1985-09-18 1989-06-13 Nissan Motor Company, Limited Fuel tank arrangement
US4856121A (en) * 1986-05-23 1989-08-15 Traylor Paul L Air gap faucet
US5425637A (en) * 1994-03-31 1995-06-20 601976 Alebrta Ltd. Method and apparatus for preventing a back flow of oral contaminants in a low volume suction line of a dental saliva ejector
US5509802A (en) * 1995-02-03 1996-04-23 White Shield Inc. Oral suction tip
US5690487A (en) * 1995-04-07 1997-11-25 White Shield Inc. Disposable oral suction tip
US5934309A (en) * 1998-08-03 1999-08-10 Clearline Systems, Inc. Collection assembly incorporating air-break design
US20060118171A1 (en) * 2002-08-09 2006-06-08 The Meyer Company Modular air gap device and faucet including same
US7134152B1 (en) 2003-12-17 2006-11-14 Clearline Systems, Inc. Adaptable, low cost air gap and flow control
US7504024B1 (en) 2005-04-19 2009-03-17 Thermaco, Inc. Apparatus for draining at least one sink
WO2014102006A1 (en) * 2012-12-28 2014-07-03 Carsten Willers Consulting Gmbh Toilet attachment comprising a showering device
US20160010319A1 (en) * 2012-12-28 2016-01-14 Carsten Willers Consulting Gmbh Bidet spray
US9909294B2 (en) 2012-03-13 2018-03-06 Neoperl Gmbh Check valve for an upwardly directed douche
EP4043652A1 (en) * 2021-02-15 2022-08-17 Keramik Holding AG Laufen Pipe interrupter and flushing system equipped therewith
WO2022189949A1 (en) * 2021-03-10 2022-09-15 Swiss Aqua Technologies Ag Intermittent module to prevent back suction of water from the bowl of a toilet with pressure flush and a toilet with pressure flushing and with an intermittent module
EP4036451A4 (en) * 2019-09-29 2023-10-25 Bestter (Xiamen) Technology Inc. Anti-backflow anti-siphon module

Families Citing this family (7)

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DE2021715C3 (en) * 1970-05-04 1982-08-12 Carl Eggemann Kg Armaturenfabrik, 5860 Iserlohn Pipe aerator for connection to a water tap of a bar counter or the like
DE2534662C2 (en) * 1975-08-02 1983-09-22 Gaggenau-Werke Haus- Und Lufttechnik Gmbh, 7560 Gaggenau Safety device for an under shower
DE2710364C2 (en) * 1977-03-10 1983-10-13 Euro Hausgeräte GmbH, 6680 Neunkirchen Backflow preventer for dishwashers and the like.
DE2908824A1 (en) * 1979-03-07 1980-09-18 Miele & Cie Backflow preventer for plumbed-in washing appliances - having centrifugal water flow around curved open surface between tangential jets
DE8709163U1 (en) * 1987-07-03 1987-08-27 Keramag Keramische Werke Ag, 4030 Ratingen, De
DE102012005004B4 (en) 2012-03-13 2021-05-27 Neoperl Gmbh Backflow barrier for an under shower
DE202014101888U1 (en) 2013-10-15 2015-01-16 Tece Gmbh Shower toilet with breakdown device

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US1830955A (en) * 1925-09-10 1931-11-10 Sloan Valve Co Flush valve device
US2056357A (en) * 1936-05-09 1936-10-06 Mary A M Luff Vacuum breaker
US2287534A (en) * 1941-03-19 1942-06-23 Gen Electric Vacuum breaker
US3072137A (en) * 1963-01-08 Fluid mixing device
US3155106A (en) * 1962-08-13 1964-11-03 Us Brass Corp Dishwasher drain airgap
US3183923A (en) * 1961-05-11 1965-05-18 Robert E Henrikson Air gap antisyphoning device

Patent Citations (6)

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Publication number Priority date Publication date Assignee Title
US3072137A (en) * 1963-01-08 Fluid mixing device
US1830955A (en) * 1925-09-10 1931-11-10 Sloan Valve Co Flush valve device
US2056357A (en) * 1936-05-09 1936-10-06 Mary A M Luff Vacuum breaker
US2287534A (en) * 1941-03-19 1942-06-23 Gen Electric Vacuum breaker
US3183923A (en) * 1961-05-11 1965-05-18 Robert E Henrikson Air gap antisyphoning device
US3155106A (en) * 1962-08-13 1964-11-03 Us Brass Corp Dishwasher drain airgap

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3747643A (en) * 1969-07-17 1973-07-24 Bowles Eng Corp Fluidically controlled siphon
US3620241A (en) * 1970-08-03 1971-11-16 Desalination Systems Combination plumbing fixture for water purification system having waste bypass flow
US4340340A (en) * 1980-12-18 1982-07-20 Plastic Machinery Corporation Vacuum system
US4454891A (en) * 1982-03-09 1984-06-19 Emerson Electric Co. (H & H Precision Products Division) Air gap drain module for use in a reverse osmosis system
US4838307A (en) * 1985-09-18 1989-06-13 Nissan Motor Company, Limited Fuel tank arrangement
US4856121A (en) * 1986-05-23 1989-08-15 Traylor Paul L Air gap faucet
US4834132A (en) * 1986-09-25 1989-05-30 Nissan Motor Company, Limited Fuel transfer apparatus
US5425637A (en) * 1994-03-31 1995-06-20 601976 Alebrta Ltd. Method and apparatus for preventing a back flow of oral contaminants in a low volume suction line of a dental saliva ejector
US5509802A (en) * 1995-02-03 1996-04-23 White Shield Inc. Oral suction tip
US5690487A (en) * 1995-04-07 1997-11-25 White Shield Inc. Disposable oral suction tip
US5934309A (en) * 1998-08-03 1999-08-10 Clearline Systems, Inc. Collection assembly incorporating air-break design
US7357147B2 (en) * 2002-08-09 2008-04-15 The Meyer Company Modular air gap device and faucet including same
US20060118171A1 (en) * 2002-08-09 2006-06-08 The Meyer Company Modular air gap device and faucet including same
US7134152B1 (en) 2003-12-17 2006-11-14 Clearline Systems, Inc. Adaptable, low cost air gap and flow control
US7504024B1 (en) 2005-04-19 2009-03-17 Thermaco, Inc. Apparatus for draining at least one sink
US9909294B2 (en) 2012-03-13 2018-03-06 Neoperl Gmbh Check valve for an upwardly directed douche
WO2014102006A1 (en) * 2012-12-28 2014-07-03 Carsten Willers Consulting Gmbh Toilet attachment comprising a showering device
US20160010319A1 (en) * 2012-12-28 2016-01-14 Carsten Willers Consulting Gmbh Bidet spray
US9879411B2 (en) 2012-12-28 2018-01-30 Carsten Willers Consulting Gmbh Toilet attachment comprising a showering device
US10301808B2 (en) * 2012-12-28 2019-05-28 Carsten Willers Consulting Gmbh Bidet spray
EP3705650A1 (en) * 2012-12-28 2020-09-09 Neoperl GmbH Toilet attachment
EP2938790B1 (en) 2012-12-28 2022-03-30 Neoperl GmbH Toilet attachment comprising a showering device
EP4050168A1 (en) * 2012-12-28 2022-08-31 Neoperl GmbH Toilet attachment with shower device
EP4036451A4 (en) * 2019-09-29 2023-10-25 Bestter (Xiamen) Technology Inc. Anti-backflow anti-siphon module
EP4043652A1 (en) * 2021-02-15 2022-08-17 Keramik Holding AG Laufen Pipe interrupter and flushing system equipped therewith
WO2022189949A1 (en) * 2021-03-10 2022-09-15 Swiss Aqua Technologies Ag Intermittent module to prevent back suction of water from the bowl of a toilet with pressure flush and a toilet with pressure flushing and with an intermittent module

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Publication number Publication date
CH444076A (en) 1967-09-15
BE679452A (en) 1966-09-16
NL6604924A (en) 1966-10-17
DE1972898U (en) 1967-11-16

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