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Class Information
Number: 137/217
Name: Fluid handling > Back flow prevention by vacuum breaking (e.g., anti-siphon devices) > Air vent in liquid flow line > Valved
Description: Apparatus wherein the air vent is provided with a valve.










Sub-classes under this class:

Class Number Class Name Patents
137/218 With co-acting valve in liquid flow path 248


Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
8567434 Closing and sealing means for air admittance valves in sanitary waste water pipe systems Oct. 29, 2013
8297299 Check vacuum breaking device for a tap Oct. 30, 2012
8297300 Anti-backflow vacuum breaker valve Oct. 30, 2012
8245721 Tube coupling device having check valve Aug. 21, 2012
8056156 Vacuum relief unit and method for a pool Nov. 15, 2011
7971598 Valve in-line backflow control Jul. 5, 2011
7934515 Backflow bonnet and poppet May. 3, 2011
7886765 Living-hinge air vent valve Feb. 15, 2011
7802586 Vacuum breaker Sep. 28, 2010
7537020 Vacuum breaking device May. 26, 2009
7527305 Hose connector with adjustable ambient air inlets May. 5, 2009
7427037 Anti-clogging showerhead device Sep. 23, 2008
7032618 Plumbing fixture block Apr. 25, 2006
6481530 Engine pre-lubrication system Nov. 19, 2002
6439939 Siphon inhibiting device for a marine cooling system Aug. 27, 2002
6317905 Spout with vacuum breaker protection Nov. 20, 2001
6125875 Pullout faucet value body with integral vacuum breaker hub Oct. 3, 2000
6032686 Cartridge valve with vacuum breaker Mar. 7, 2000
5947784 Apparatus for producing toroidal bubbles and method Sep. 7, 1999
5839464 Cartridge valve with vacuum breaker Nov. 24, 1998
5803112 Reflux valve means Sep. 8, 1998
5564457 Vacuum breaker valve with CIP capability Oct. 15, 1996
5533546 Assembly for prevention of backflow in valves Jul. 9, 1996
5487406 Drain control valve and manifold system Jan. 30, 1996
5404898 Anti-syphon fluid control valve apparatus and method Apr. 11, 1995
5372158 Valve with backflow preventer Dec. 13, 1994
5360029 Vacuum breaker Nov. 1, 1994
5329957 Fluid flow system vacuum breaker Jul. 19, 1994
5325885 Anti-siphon device for sanitary appliance Jul. 5, 1994
5304116 Vaginal cleansing device Apr. 19, 1994
5285808 Diverting relief valve backflow Feb. 15, 1994
5240029 Hose-type faucet with backflow preventer Aug. 31, 1993
5199455 Anti-siphon device for drain conduits Apr. 6, 1993
5133498 Apparatus for dispensing/applying a material Jul. 28, 1992
5103856 Anti-siphoning valve assembly Apr. 14, 1992
5082017 Anti-siphon ball cock with volume control Jan. 21, 1992
4998554 Food pasteurization system vacuum breaker Mar. 12, 1991
4991623 Automatic air valves for ducts Feb. 12, 1991
4969483 Device against siphon back flow, for hydraulic valves having a cartridge with plane plates for flux control Nov. 13, 1990
4921258 Adapter seal May. 1, 1990
4834621 Air throttling valve for submerged pump system May. 30, 1989
4827538 Mixing fixture for flexible-pipe spray head May. 9, 1989
4811753 Recreational vehicle drain vent Mar. 14, 1989
4805661 Faucet valve with anti-siphon back flow preventer Feb. 21, 1989
4712574 Vacuum-breaking valve for pressurized fluid lines Dec. 15, 1987
4696322 Faucet valve with anti-siphon back flow preventer Sep. 29, 1987
4646775 Vacuum breaker Mar. 3, 1987
4637080 Air volume control Jan. 20, 1987
4586692 Flushometer valve integrable with a structure May. 6, 1986
4545398 Venting device Oct. 8, 1985

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