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Class Information
Number: 137/535
Name: Fluid handling > Line condition change responsive valves > Direct response valves (i.e., check valve type) > Reciprocating valves > Spring biased
Description: Valves in which the elasticity of a resilient element is used to provide the biasing force.










Sub-classes under this class:

Class Number Class Name Patents
137/539 Ball valves 184
137/538 Piston-type valves 160
137/540 Spring coaxial with valve 286
137/537 Spring under tension 29
137/536 With means to protect spring from fluid 66


Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
8689824 Disc check valve construction Apr. 8, 2014
8640271 Cartridge unit and trap for sewer gas and odor containment Feb. 4, 2014
8608004 Sprayer tank cap with incorporated pressure relief valve Dec. 17, 2013
8539975 Drill string valve and method Sep. 24, 2013
8511339 Fuel pressure controller Aug. 20, 2013
8403428 Check valve and brake hydraulic pressure control device using the same Mar. 26, 2013
8387655 Slurry flow control device Mar. 5, 2013
8276614 Suction valve of variable capacity compressor for vehicle Oct. 2, 2012
8276613 One-way valve of variable capacity compressor for vehicle Oct. 2, 2012
8069950 Environmental compressor protection assembly Dec. 6, 2011
8015989 Method and apparatus for dampening pressure fluctuations in a fluid delivery system Sep. 13, 2011
7955301 Injection shut off valve with pressure actuator for delivery of compositions Jun. 7, 2011
7766028 Pressure regulator Aug. 3, 2010
7766027 Vented steamer port cap assembly Aug. 3, 2010
7540431 By-pass valve for heat exchanger Jun. 2, 2009
7458392 Spring actuated check valve Dec. 2, 2008
7426932 Spray fill device and method for using the same Sep. 23, 2008
7341108 Well downhole liquid dispenser Mar. 11, 2008
7334594 Apparatus and method for adjusting a locking mechanism of a shunt valve Feb. 26, 2008
7310942 Exhaust passage control valve Dec. 25, 2007
7258136 Pressure regulator Aug. 21, 2007
7258135 Pressure regulator for a fuel supply system of an internal combustion engine Aug. 21, 2007
7237409 Steam cleaner with safety device Jul. 3, 2007
6948521 Check valve device Sep. 27, 2005
6892758 Check valve with vibration prevention function for valve body May. 17, 2005
6681796 Drainage valve pipe tap assembly Jan. 27, 2004
6681798 Pressure regulator Jan. 27, 2004
6662824 Check valve slantedly biased against pressure-imposing direction Dec. 16, 2003
6581721 Valve for a control muffler Jun. 24, 2003
6527524 Double acting simplex plunger pump with bi-directional valves Mar. 4, 2003
6527006 Exhaust valve assembly Mar. 4, 2003
6508932 Filter with valve having a hydrophobic coating Jan. 21, 2003
6484720 Five spring regulator Nov. 26, 2002
6443184 Radially loaded, poppet-type check valve Sep. 3, 2002
6432135 Torsion heart valve Aug. 13, 2002
6338246 Exhaust passage control valve Jan. 15, 2002
6237633 Low emission disconnect system May. 29, 2001
6227239 Spring-loaded safety valve May. 8, 2001
6227299 Flapper valve with biasing flapper closure assembly May. 8, 2001
6164311 Pressure regulator for watering system Dec. 26, 2000
6155295 Low emission disconnect system Dec. 5, 2000
6102682 Slidable discharge valve in a hermetic rotary compressor Aug. 15, 2000
6024126 Uniform cross-section and ribbed thermoplastic compressor valve Feb. 15, 2000
5931190 Relief valve Aug. 3, 1999
5913331 Check valve Jun. 22, 1999
5873385 Check valve Feb. 23, 1999
5855225 Tank transport pressure relief valve assembly Jan. 5, 1999
5713390 Pressure gauge capable of automatically discharging air therefrom Feb. 3, 1998
5680881 Valve system for hermetic reciprocating compressor Oct. 28, 1997
5564467 Poppet check valve Oct. 15, 1996

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