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Class Information
Number: 137/493.2
Name: Fluid handling > Line condition change responsive valves > Bi-directional flow valves > One head and seat carried by head of another > Supporting valve only spring biased
Description: Apparatus wherein only the carrying valve is provided with spring biasing means.










Patents under this class:

Patent Number Title Of Patent Date Issued
8091583 Double check valve for a fuel system Jan. 10, 2012
7451780 Multifunction valve for use in a hydraulic component Nov. 18, 2008
7438081 Valve for an inflatable and method of use Oct. 21, 2008
7234487 Cross-over relief valve assembly for use in bi-directional circuit Jun. 26, 2007
6840262 Fuel blocking valve device Jan. 11, 2005
6810900 Composite type air vent valve of fuel tank and air vent mechanism Nov. 2, 2004
6502557 Check valve for engine fuel supply system Jan. 7, 2003
6164320 Damper valve for hydraulic power steering device Dec. 26, 2000
5803115 Valve for relieving pressure and vacuum conditions in a tank Sep. 8, 1998
5682920 Valve device for priming a pump, particularly for coffee making machines Nov. 4, 1997
5666989 Tank venting control assembly Sep. 16, 1997
5632298 Resuscitation and inhalation device May. 27, 1997
5494069 Check valve Feb. 27, 1996
5261439 Vacuum-actuated vent assembly Nov. 16, 1993
5261447 Pneumatic regulating valve Nov. 16, 1993
5004008 Variable area refrigerant expansion device Apr. 2, 1991
4974631 Dome pressure maintaining valve Dec. 4, 1990
4805663 Flow control valve Feb. 21, 1989
4765227 Die cylinder assembly Aug. 23, 1988
4742844 Flow control valve May. 10, 1988
4715403 Flow control valve Dec. 29, 1987
4694651 Brake master cylinder Sep. 22, 1987
4664141 Minimum pressure retention valve May. 12, 1987
4657040 Bypass reverse flow valve Apr. 14, 1987
4625755 Kelly mud saver valve sub Dec. 2, 1986
4570972 Pressure control valving for pneumatic leveling systems Feb. 18, 1986
4561460 Dual orifice control Dec. 31, 1985
4458711 Vent valve Jul. 10, 1984
4437457 Artificial sphincter with improved pressure control valve Mar. 20, 1984
4392511 Pressure regulator Jul. 12, 1983
4378815 Pressure control device with a fluid discharge prevention mechanism Apr. 5, 1983
4377176 Pressure reducer for hydraulic brake systems Mar. 22, 1983
4364407 Mud saver valve Dec. 21, 1982
4325407 Pressure control unit Apr. 20, 1982
4165816 Vent cap Aug. 28, 1979
4068680 Self-contained vent valve unit and system utilizing the same Jan. 17, 1978
4059125 Pressure container with an injection valve provided with a fusible valve member Nov. 22, 1977
4040404 Fuel tank pressure-vacuum relief valve Aug. 9, 1977
4010721 Vacuum delay/relief valve Mar. 8, 1977
3976096 Valve Aug. 24, 1976











 
 
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