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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
4763689 Vacuum check valve Aug. 16, 1988
4756333 Vacuum check valve Jul. 12, 1988
4750517 Vacuum check valve Jun. 14, 1988
4750516 Vacuum check valve Jun. 14, 1988
4737148 Filtered T coupling Apr. 12, 1988
4735607 Nasogastric tube antireflux valve Apr. 5, 1988
4724867 Vacuum check valve Feb. 16, 1988
4719937 Marine riser anti-collapse valve Jan. 19, 1988
4687021 Vacuum valve-sensor device Aug. 18, 1987
4643221 Vacuum check valve Feb. 17, 1987
4628959 Vacuum check valve Dec. 16, 1986
4569208 Pressure relief port Feb. 11, 1986
4556084 Air admittance valve Dec. 3, 1985
4545398 Venting device Oct. 8, 1985
4535807 Automatic air valve device for ducts Aug. 20, 1985
4518014 Relief valves for sanitation systems or the like May. 21, 1985
4502502 Overpressure safety valve Mar. 5, 1985
4493339 Air valve for a breathing system Jan. 15, 1985
4436107 Ventilation valve Mar. 13, 1984
4398557 Combination vacuum relief valve and pressure relief valve Aug. 16, 1983
4335743 Milking machine system, and pressure regulator incorporated therein Jun. 22, 1982
4332276 Fuel hose drainage apparatus Jun. 1, 1982
4323096 Combination vacuum relief valve and pressure relief valve which are protected from the atmosphere Apr. 6, 1982
4278107 Automatic vacuum relief valve for hopper cars Jul. 14, 1981
4273153 Vibration resistant pressure actuated vacuum breaker Jun. 16, 1981
4257445 Shielded vent port Mar. 24, 1981
4250360 Device to automatically activate or deactivate control means Feb. 10, 1981
4245668 Pressure regulator Jan. 20, 1981
4232706 Automatic valve device for sanitation waste pipes Nov. 11, 1980
4224044 Air cleaner with valve means for preventing fuel vapor escape Sep. 23, 1980
4184509 Vacuum relief and access door assembly Jan. 22, 1980
4180066 Safety interface and valve for anesthesia gas scavenging Dec. 25, 1979
4176666 Gas scavenger system Dec. 4, 1979
4173204 Control valve of exhaust recirculation apparatus Nov. 6, 1979
4148335 Relief valve improvement Apr. 10, 1979
4142645 Vacuum sealing closure lid for home canning operations Mar. 6, 1979
4140151 Vacuum relief door assembly Feb. 20, 1979
4091837 Freezeproof breather valve May. 30, 1978
3967605 Intake vacuum controlled manifold vacuum spoiler Jul. 6, 1976
3957001 Furnace implosion door May. 18, 1976

1 2 3










 
 
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