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Class Information
Number: 137/514
Name: Fluid handling > Line condition change responsive valves > Direct response valves (i.e., check valve type) > With retarder or dashpot
Description: Valves provided with a dashpot or other retarding means to prevent or reduce chattering or hunting of the valve.










Sub-classes under this class:

Class Number Class Name Patents
137/514.3 End of valve forms dashpot chamber 46
137/514.5 End of valve moves inside dashpot chamber 90


Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
4729402 Compressor valve noise attenuation Mar. 8, 1988
4724867 Vacuum check valve Feb. 16, 1988
4723572 Compressor valve Feb. 9, 1988
4716930 Pneumatic time delay valve Jan. 5, 1988
4698060 Pressure regulation system Oct. 6, 1987
4669500 Check valve actuator Jun. 2, 1987
4643220 Unidirectional fluid control valve Feb. 17, 1987
4627464 Unidirectional, fluid control valve Dec. 9, 1986
4607661 Check value Aug. 26, 1986
4601309 Valve and dash-pot assembly Jul. 22, 1986
4580595 Hydraulic check valve Apr. 8, 1986
4570666 Unidirectional, fluid control valve Feb. 18, 1986
4556083 Pressure relief valve and method for modification thereof Dec. 3, 1985
4545562 Device for elimination of vibrations of a valve for decompression of an enclosure Oct. 8, 1985
4537216 Anti-knock liquid flow control valve Aug. 27, 1985
4531541 Plate-type valve, and an improved valve seat and a valve seat assembly therefor Jul. 30, 1985
4498494 Air control for a lumbar support device Feb. 12, 1985
4495859 Cover assembly for vertical exhaust pipes Jan. 29, 1985
4485843 Variable pressure relief and control valve Dec. 4, 1984
4481974 Safety valve with friction means for damping valve vibration Nov. 13, 1984
4407325 Arcuate swing check valve Oct. 4, 1983
4398559 Valve member and assembly with inlet and outlet pressure relief grooves Aug. 16, 1983
4396034 Arcuate swing check valve Aug. 2, 1983
4360319 Compressor Nov. 23, 1982
4357956 Safety valve with vibration-damped valve spring Nov. 9, 1982
4351358 Check-valve construction Sep. 28, 1982
4350179 Valve assembly with relief groove Sep. 21, 1982
4340085 Pressure regulating device with damping means for preventing valve chatter Jul. 20, 1982
4336134 Float-actuated level control valve Jun. 22, 1982
4330006 Damping device for check valves May. 18, 1982
4286621 Dual acting check valve dampener Sep. 1, 1981
4261380 Flow regulator having damping means Apr. 14, 1981
4256139 Valve assembly for high-pressure piston pump Mar. 17, 1981
4211250 Pressure relief valve Jul. 8, 1980
4196746 Gas compressor valve Apr. 8, 1980
4194527 Pressure limiting valve Mar. 25, 1980
4188973 Check valve Feb. 19, 1980
4182366 Positive end expiratory pressure device Jan. 8, 1980
4112959 Adjustable check valve Sep. 12, 1978
4088150 Valve for the automatic flow control of a fluid in a conditioning system May. 9, 1978
4061535 Industrial technique Dec. 6, 1977
4057072 Unloader valve Nov. 8, 1977
4039270 Fluid suction and discharge apparatus Aug. 2, 1977
4030520 Ball-type safety valve Jun. 21, 1977
4024888 Evaporator pressure regulator May. 24, 1977
3945397 Plate valve Mar. 23, 1976
3942551 Hydraulic damping means for hinged check valve Mar. 9, 1976
3939867 Valve for compressors Feb. 24, 1976

1 2 3










 
 
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