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Class Information
Number: 137/536
Name: Fluid handling > Line condition change responsive valves > Direct response valves (i.e., check valve type) > Reciprocating valves > Spring biased > With means to protect spring from fluid
Description: Valves provided with means preventing or reducing the impingement of the pressure fluid on the spring, usually a flexible wall, deflecting baffles or a telescoping enclosure for the spring.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8413277 Pneumatic lift with unidirectional valve Apr. 9, 2013
8316880 Oil filter bypass valve assembly for a generator Nov. 27, 2012
7628016 Method of effecting multistage super-charging in internal combustion engines Dec. 8, 2009
7588047 Compressor bypass valve for use in multistage supercharging Sep. 15, 2009
7201184 Pressure protection valve Apr. 10, 2007
7178784 Valve assembly and method Feb. 20, 2007
7028702 Automatic water pressure control valve balancing temperature of mixed water Apr. 18, 2006
7025085 Radial poppet-type check valve with closure assist feature Apr. 11, 2006
6971404 Pressure protection valve Dec. 6, 2005
6899113 Pressure relief valve May. 31, 2005
6874531 Relief valve Apr. 5, 2005
6789569 Pressure relief valve with a spring-loaded membrane closing body Sep. 14, 2004
6769460 Control valve Aug. 3, 2004
6622752 Pressure relief valve Sep. 23, 2003
6581632 Automatic valve Jun. 24, 2003
6340031 Check valve for refueling pipe of fuel tank Jan. 22, 2002
6318973 Fuel pump Nov. 20, 2001
6250329 Snap open pressure relief valve Jun. 26, 2001
6163895 Plunger apparatus Dec. 26, 2000
5855225 Tank transport pressure relief valve assembly Jan. 5, 1999
5799871 Spray nozzle with discrete open/close deadband and method therefor Sep. 1, 1998
5782259 Pressure relief valve Jul. 21, 1998
5722455 Nozzle closing valve, as well as pressure atomizer nozzle having such a nozzle closing valve Mar. 3, 1998
5678604 Fast opening, slow closing, relief valve Oct. 21, 1997
5465751 Excess flow valve Nov. 14, 1995
5462076 Pressure-compensated pressure limiting valve Oct. 31, 1995
5415303 Railcar cushion unit May. 16, 1995
5261450 Pressure relief vent with surge suppression Nov. 16, 1993
5245976 Air induction control device Sep. 21, 1993
5174327 In-line check valve Dec. 29, 1992
5113837 Air induction control device May. 19, 1992
5097865 Valved flash sterilization container Mar. 24, 1992
5065790 Check valve Nov. 19, 1991
5036882 Valve assembly for decanter for wastewater treatment facility Aug. 6, 1991
4905657 Emission control valve with gas flow shut-off Mar. 6, 1990
4798329 Combined fuel injector and pressure regulator assembly Jan. 17, 1989
4781217 Pulse-irrigation method and apparatus Nov. 1, 1988
4766924 Pressure relief valve Aug. 30, 1988
4765364 Pressure activated valve for sanitary systems Aug. 23, 1988
4748003 Container for flash sterilization May. 31, 1988
4742997 Gas spring with separate charging and pressure relief valves May. 10, 1988
4727902 Valve arrangement Mar. 1, 1988
4719938 Self-cleaning valve and cryopump utilizing the same Jan. 19, 1988
4687021 Vacuum valve-sensor device Aug. 18, 1987
4678004 Quick-action on/off valve Jul. 7, 1987
4561466 Valve for supplying flow media Dec. 31, 1985
4515179 Pressure relief valve with adjustment for set pressure May. 7, 1985
4498497 Flow meter bypass valve assembly Feb. 12, 1985
4485844 Back pressure inducer Dec. 4, 1984
4485843 Variable pressure relief and control valve Dec. 4, 1984

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