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Class Information
Number: 137/514.7
Name: Fluid handling > Line condition change responsive valves > Direct response valves (i.e., check valve type) > With retarder or dashpot > End of valve moves inside dashpot chamber > Enlarged piston on end of valve stem
Description: Devices wherein an enlarged member on the end of a valve stem reciprocates in a dashpot chamber.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8517703 Compressor including valve assembly Aug. 27, 2013
8381764 Check valve Feb. 26, 2013
8365764 Minimum pressure valve Feb. 5, 2013
8104739 Pulse valve Jan. 31, 2012
7913715 Relief valve including a check valve in a damping chamber Mar. 29, 2011
RE41861 Decoupled check-relief valve Oct. 26, 2010
7628174 Hydraulic control arrangement Dec. 8, 2009
7234486 Pressure limiting valve for fuel injection devices Jun. 26, 2007
7124774 Control valve Oct. 24, 2006
6978799 Emergency pressure relief valve with enhanced reset Dec. 27, 2005
6966302 Fuel system and flow control valve Nov. 22, 2005
6918407 Pneumatic reset relief valve Jul. 19, 2005
6874536 Gas supply apparatus Apr. 5, 2005
6796260 Elastomeric ejection system with acoustically improved check valve Sep. 28, 2004
6564827 Shut-off device for the filling device of a pressure tank May. 20, 2003
6510867 Pressure relief valve Jan. 28, 2003
6209561 Emergency pressure relief valve Apr. 3, 2001
6132191 Check valve for scroll compressor Oct. 17, 2000
6102072 Water-hammerless check valve Aug. 15, 2000
5975129 Hydraulically operated pressure relief valve Nov. 2, 1999
5921276 Piston-type check valve with diffuser Jul. 13, 1999
5871109 Railcar cushion device preload valving systems Feb. 16, 1999
5826735 Railcar cushion device valving systems Oct. 27, 1998
5787926 Overload preventive device Aug. 4, 1998
5685334 Fuel additive metering system Nov. 11, 1997
5678604 Fast opening, slow closing, relief valve Oct. 21, 1997
5603348 Damped poppet valve Feb. 18, 1997
5456283 Infinite hydraulic check Oct. 10, 1995
5443088 Squib valve Aug. 22, 1995
5441072 Fuel additive metering system Aug. 15, 1995
5439027 High pressure regulating valve Aug. 8, 1995
5362219 Internal combustion engine with compound air compression Nov. 8, 1994
5261450 Pressure relief vent with surge suppression Nov. 16, 1993
5251618 Regulator second stage for scuba Oct. 12, 1993
5240036 Check valve with poppet dashpot/frictional damping mechanism Aug. 31, 1993
5234482 Retarding valve at a single-tower air drier Aug. 10, 1993
5232013 Check valve with poppet damping mechanism Aug. 3, 1993
5218952 Radiant heating apparatus Jun. 15, 1993
5065789 Back pressure regulating valve for ultra high pressures Nov. 19, 1991
4867603 Device for preventing flooding caused by sprinkler failure Sep. 19, 1989
4859155 Bypass valve for a displacement pump Aug. 22, 1989
4813452 Kinetic check valve Mar. 21, 1989
4747426 Check valve May. 31, 1988
4724866 Speed control valve Feb. 16, 1988
4693269 Check valve assembly for pipeline system Sep. 15, 1987
4646644 Pneumatic time delay valve Mar. 3, 1987
4617959 Check valve assembly for pipeline system Oct. 21, 1986
4614168 Control valve for dual fuel operation of an internal combustion engine Sep. 30, 1986
4603710 Non-return valve Aug. 5, 1986
4592383 Constant-flow valve Jun. 3, 1986

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