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Class Information
Number: 137/538
Name: Fluid handling > Line condition change responsive valves > Direct response valves (i.e., check valve type) > Reciprocating valves > Spring biased > Piston-type valves
Description: Valves in which the valve is a cylindrical plug cooperating with a hollow cylindrical valve seat, there being ports in the cylindrical wall of either piston or seat which are opened and closed by reciprocating movement of the piston in the cylindrical seat.










Patents under this class:
1 2 3 4

Patent Number Title Of Patent Date Issued
8671975 Compliant-seal check valve Mar. 18, 2014
8667983 Relief valve for oil pump Mar. 11, 2014
8668015 Dual check valve Mar. 11, 2014
8640776 Fluid injection device Feb. 4, 2014
8631820 Hydraulic control valve for construction machinery Jan. 21, 2014
8608004 Sprayer tank cap with incorporated pressure relief valve Dec. 17, 2013
8602053 Valve assembly for a differential pressure sensor with automatic zero point calibration and flushing Dec. 10, 2013
8602054 Valve assembly for a differential pressure sensor with safety valve Dec. 10, 2013
8573249 Relief valve for oil pump Nov. 5, 2013
8434508 Relief valve May. 7, 2013
8397748 Check valve having two seats Mar. 19, 2013
8393156 Variable performance valve of a fuel nozzle for a turbine engine Mar. 12, 2013
8316880 Oil filter bypass valve assembly for a generator Nov. 27, 2012
8302621 Pressure limiting valve with reduced differential area Nov. 6, 2012
8297307 Relief valve structure Oct. 30, 2012
8191573 Pressure regulating valve with a direct damping action Jun. 5, 2012
8186440 Fluid injection device May. 29, 2012
8181705 Fluid injection device May. 22, 2012
8069876 Sealing bush, hydraulic unit, and check valve Dec. 6, 2011
8056575 Check valve structure for use in pump of hydraulic cylinder Nov. 15, 2011
8051876 Pressure limiting valve with a hydraulic seal ring Nov. 8, 2011
8047227 Pressure limiting valve Nov. 1, 2011
7631656 Pressure control valve Dec. 15, 2009
7540431 By-pass valve for heat exchanger Jun. 2, 2009
7503343 Siphonable check valve and method of making same Mar. 17, 2009
7395836 Screwable check valve Jul. 8, 2008
7387136 Fuel pressure regulation valve Jun. 17, 2008
7383833 Valve for air tank Jun. 10, 2008
7380569 Valve body for backflow prevention valve Jun. 3, 2008
7360557 Low pressure drop check valve Apr. 22, 2008
7353842 Air fitting with an integral check valve Apr. 8, 2008
7331361 Pressure relief valve with direct hydraulic damping Feb. 19, 2008
7322373 High accuracy low leakage valve for high pressure applications Jan. 29, 2008
7290562 Non-return valve Nov. 6, 2007
7264019 Controlled-flow hydraulic distributor Sep. 4, 2007
7231912 Valve for air tank Jun. 19, 2007
7182171 Muffler with variable acoustic properties Feb. 27, 2007
7163008 Valve for air tank Jan. 16, 2007
7044157 By-pass valve unit for a high pressure liquid delivery unit May. 16, 2006
6978801 Backflow prevention valve Dec. 27, 2005
6978800 Closure device with self-aligning poppet Dec. 27, 2005
6971404 Pressure protection valve Dec. 6, 2005
6971406 Backflow prevention valve Dec. 6, 2005
6959727 Siphonable check valve and method of making same Nov. 1, 2005
6953053 Pressure relief valve assembly Oct. 11, 2005
6938641 Check valve Sep. 6, 2005
6915813 Check valve Jul. 12, 2005
6877525 Check valve for fuel pump Apr. 12, 2005
6769446 Freeze protection device for wall hydrants/faucets Aug. 3, 2004
6736161 Pressure regulating valve May. 18, 2004

1 2 3 4










 
 
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