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Class Information
Number: 137/533.29
Name: Fluid handling > Line condition change responsive valves > Direct response valves (i.e., check valve type) > Reciprocating valves > Weight biased > Valve body is the weight > Guided head > Guide stem > Guide and seat integral unit
Description: Devices in which the valve seat and the guide for the rod-like element constitute a unit.

Patents under this class:

Patent Number Title Of Patent Date Issued
8136548 Air admittance valve Mar. 20, 2012
5979497 Check valve Nov. 9, 1999
5913330 Pressure/vacuum relief valve assembly Jun. 22, 1999
5803112 Reflux valve means Sep. 8, 1998
5701931 Water relief valve for a drainage system Dec. 30, 1997
5564825 Integral inlet valve and mixer to promote mixing of fluids in a tank Oct. 15, 1996
5297579 Ball and seat-type check valve for downhole rod pump Mar. 29, 1994
5203857 Gas compressor head and discharge valve construction Apr. 20, 1993
5117861 Ball and seat-type valve for downhole rod pump Jun. 2, 1992
5099878 Tube mounted low pressure check valve Mar. 31, 1992
5036881 Hydrostatic relief valve Aug. 6, 1991
4934405 Safety valve Jun. 19, 1990
4742847 Excess pressure valve for a boiler of a steamer for the steam treatment of food May. 10, 1988
4535807 Automatic air valve device for ducts Aug. 20, 1985
4340080 Inflation valve Jul. 20, 1982
4257445 Shielded vent port Mar. 24, 1981
3990680 Valve construction and method of making the same Nov. 9, 1976

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