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Class Information
Number: 137/513.5
Name: Fluid handling > Line condition change responsive valves > Direct response valves (i.e., check valve type) > With leak passage > Permits flow at valve interface
Description: Devices in which the nominally engaging surfaces of the head and/or seat elements are so constructed or arranged that when the valve is closed, a limited flow passage exists between said surfaces.










Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8690019 Head for dispensing a liquid as a drip Apr. 8, 2014
8517052 Pressurized vapor cycle liquid distillation Aug. 27, 2013
8496137 Solenoid valve assembly for a dispensing system Jul. 30, 2013
8474415 Internally dampened pressure relief valve Jul. 2, 2013
8439069 Air release valve May. 14, 2013
8408864 Device for regulating the flow rate of air feeding a turbine ventilation cavity of a turbomachine turbine section Apr. 2, 2013
8291926 Reductant dosing system having anti-aeration device Oct. 23, 2012
8251066 Exhalation port with built-in entrainment valve Aug. 28, 2012
8196597 Check valve Jun. 12, 2012
8146617 Check valve Apr. 3, 2012
8069877 Pressure compensating flush valve with self-cleaning piston Dec. 6, 2011
7955061 Priming pump for a circuit subjecting said pump to an outlet pressure greater than an inlet pressure Jun. 7, 2011
7874309 Compressor Jan. 25, 2011
7658405 Apparatus and method for providing extended inflator output Feb. 9, 2010
7581560 Check valve Sep. 1, 2009
7387109 High-pressure fuel pump for an internal combustion engine Jun. 17, 2008
7367353 Combined check valve and pressure relief valve May. 6, 2008
7258134 Combination check valve and pressure rise rate valve Aug. 21, 2007
7207349 Hydraulic flow pressure switch Apr. 24, 2007
7152617 High pressure release safety valve assembly Dec. 26, 2006
7114512 Gas safety device Oct. 3, 2006
7028708 Combined check valve and pressure relief valve Apr. 18, 2006
7007708 Flow control valve Mar. 7, 2006
6981516 Fail save shut off valve for filtering systems employing candle filters Jan. 3, 2006
6935850 Axially aligned dual piston cylinder air pump with a common head portion Aug. 30, 2005
6889707 Pressure actuated shut-off valve with membrane May. 10, 2005
6520205 Compressor unloader system Feb. 18, 2003
6520419 Supercooling degree control type expansion valve Feb. 18, 2003
6427714 Fluid flow valve with variable flow rate Aug. 6, 2002
6250327 Fluid flow valve with variable flow rate Jun. 26, 2001
6176257 Regulated air suction valve Jan. 23, 2001
6109296 Dribble flow valve Aug. 29, 2000
6102075 Flow control device Aug. 15, 2000
5918623 Starting valve Jul. 6, 1999
5913642 Feed chute for fiber tufts Jun. 22, 1999
5895208 Reciprocating piston machine with capillary passages on valves for pressure relief Apr. 20, 1999
5878773 Auxiliary flow path valve Mar. 9, 1999
5842609 Personal hygiene liquids dispenser Dec. 1, 1998
5816291 Shock absorber for liquid conduits Oct. 6, 1998
5797421 Dry hydrant siphon assembly Aug. 25, 1998
5771923 Gasketing and bleed means for an electrically controlled faucet assembly Jun. 30, 1998
5769573 Apparatus for controlling air flow in an air duct Jun. 23, 1998
5704391 Gravity-operated gas shut-off valve Jan. 6, 1998
5613518 Device for restricting excess flow Mar. 25, 1997
5595214 Hydraulic coupling for vehicle drivetrain Jan. 21, 1997
5592966 Back-flow preventer Jan. 14, 1997
5525046 High pressure cleaning device with leakage flow arrangement Jun. 11, 1996
5509437 Dry hydrant check valve Apr. 23, 1996
5477879 Control valves Dec. 26, 1995
5454398 Throughflow valve and a metal mould tool for manufacturing a valve seat or a valve body Oct. 3, 1995

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