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Class Information
Number: 137/526
Name: Fluid handling > Line condition change responsive valves > Direct response valves (i.e., check valve type) > Vacuum relief type
Description: Valves which open in response to an excessive decrease in pressure, e.g., to admit atmospheric air.










Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
5996563 Air intake device Dec. 7, 1999
5991939 Pool safety valve Nov. 30, 1999
5983929 Air valve Nov. 16, 1999
5971014 Vacuum breaker valve vent fitting clean-out device Oct. 26, 1999
5960823 Tank vacuum limiter assembly Oct. 5, 1999
5957157 Pilot operated pressure/vacuum vent for a fuel storage tank Sep. 28, 1999
5934318 Valve system Aug. 10, 1999
5881759 Air-ventilating valve Mar. 16, 1999
5853162 Electromagnetic control valve responsive to positive and negative pressures Dec. 29, 1998
5836170 Vacuum release valve tube assembly Nov. 17, 1998
5836345 Vacuum breaker vent valve packaging and installation system Nov. 17, 1998
5822807 Suction relief apparatus Oct. 20, 1998
5803112 Reflux valve means Sep. 8, 1998
5775390 Apparatus for extraction of a fluent material from a container Jul. 7, 1998
5765595 Air/vacuum valve throttling apparatus Jun. 16, 1998
5706854 Venturi vent valve Jan. 13, 1998
5682624 Vacuum relief safety valve for a swimming pool filter pump system Nov. 4, 1997
RE35532 Air Admittance valve for resisting high internal pressure Jun. 17, 1997
5617893 Vacuum relief valve Apr. 8, 1997
5564457 Vacuum breaker valve with CIP capability Oct. 15, 1996
5535900 Bottle cap with an air removing device Jul. 16, 1996
5419366 Valve May. 30, 1995
5402822 Anti-cavitation valve Apr. 4, 1995
5365964 Vacuum valve to be used in an emergency system to reduce the risk of escape of liquid from tankers due to injuries under the waterline Nov. 22, 1994
5363877 Suction regulating valve Nov. 15, 1994
5363878 Relief valve Nov. 15, 1994
5301718 Apparatus and process for metering a low pressure fluid into a high pressure fluid flow Apr. 12, 1994
5285547 Internal by-pass valve for submersible suction cleaner Feb. 15, 1994
5279439 Fuel cap for a pressured fuel tank Jan. 18, 1994
5273068 Air admittance valve for resisting high internal pressure Dec. 28, 1993
5213127 Vacuum valve for use in an emergency system for reducing the risk of escape from injuries under the waterline of tankers May. 25, 1993
5213268 Sprayer faucet with antibackflow protection May. 25, 1993
5161573 Pressure equalizing damper Nov. 10, 1992
5117860 Check valve Jun. 2, 1992
5105848 Automatic relief valve Apr. 21, 1992
5048562 One way air admittance valve Sep. 17, 1991
5040002 Regulator for ink-jet pens Aug. 13, 1991
5033504 Automatic relief valve Jul. 23, 1991
4998554 Food pasteurization system vacuum breaker Mar. 12, 1991
4991623 Automatic air valves for ducts Feb. 12, 1991
4974632 Automatic air valves for ducts Dec. 4, 1990
4962548 Valve assembly Oct. 16, 1990
4951708 Vacuum check valve Aug. 28, 1990
4941503 Vacuum assembly including an improved vacuum relief valve assembly Jul. 17, 1990
4921258 Adapter seal May. 1, 1990
4886085 Vacuum check valve and method of control Dec. 12, 1989
4867802 Air admittance valve for use in drainage systems Sep. 19, 1989
4856554 Vacuum check valve and method of control Aug. 15, 1989
4827538 Mixing fixture for flexible-pipe spray head May. 9, 1989
4806082 Fluid actuated pump with improved flow-limiting fluid refill valve Feb. 21, 1989

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