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Class Information
Number: 137/493
Name: Fluid handling > Line condition change responsive valves > Bi-directional flow valves
Description: Apparatus in which a valve means opens in response to excess pressure over a selected maximum and also opens in response to pressure below a selected minimum, usually to admit atmospheric air, or opens in response to a pressure applied to either side of the valve means.










Sub-classes under this class:

Class Number Class Name Patents
137/493.9 Axes of ports co-axial 195
137/493.8 Axes of ports parallel 145
137/493.7 Axes of ports perpendicular 34
137/493.1 One head and seat carried by head of another 33


Patents under this class:
1 2 3 4

Patent Number Title Of Patent Date Issued
8662104 Slot valve for use in the pneumatic switching circuit of a respirator Mar. 4, 2014
8657590 Hydraulic power steering system with charging valve and air cushion in the tank Feb. 25, 2014
8534314 Explosion protection valve Sep. 17, 2013
8511804 Ink cartridge for an ink jet printer Aug. 20, 2013
8469051 Valve for limiting the tank pressure in a motor vehicle Jun. 25, 2013
8375982 Hydraulic circuit and manifold with multifunction valve Feb. 19, 2013
8348642 Active mud valve system Jan. 8, 2013
8302632 Mount structure of two-way valve for fuel tank of small boat Nov. 6, 2012
8066030 Fuel conveying device Nov. 29, 2011
8020583 Hydraulic valve arrangement Sep. 20, 2011
7997297 System and method for performing a chemical experiment Aug. 16, 2011
7874820 Compressor unloading valve Jan. 25, 2011
7841360 Valve, especially proportional pressure control valve Nov. 30, 2010
7823404 Air conditioning system with variable condenser reheat and refrigerant flow sequencer Nov. 2, 2010
7819130 Metering orifice arrangement for a hydraulic current divider and current adding device Oct. 26, 2010
7757704 Coupling assembly with a core unit therein Jul. 20, 2010
7691088 Vascular access device Apr. 6, 2010
7527075 Flow Regulator May. 5, 2009
7527070 Flow control valve and method May. 5, 2009
7513111 Shock valve for hydraulic device Apr. 7, 2009
7481320 Filter device having a bi-directional valve Jan. 27, 2009
7401623 Double-acting valve unit Jul. 22, 2008
7357150 Safety shut-off device Apr. 15, 2008
7302966 Flow control valve and method Dec. 4, 2007
7299819 Water flow sensor alone and in combination with a method and apparatus for selectively shutting off the flow of water to a building Nov. 27, 2007
7252652 Valved catheters including high flow rate catheters Aug. 7, 2007
7234487 Cross-over relief valve assembly for use in bi-directional circuit Jun. 26, 2007
7147121 Valve for non-spill cup Dec. 12, 2006
7086413 Bi-directional damper valve for a hydraulic line, power steering system incorporating the damper valve, and methods of using same Aug. 8, 2006
7080659 Damper valve and hydraulic power steering apparatus using the same Jul. 25, 2006
7044150 Combination vent/check valve assembly May. 16, 2006
7040301 Fuel system with integrated pressure management May. 9, 2006
7028707 Valve for use with chest drainage system Apr. 18, 2006
7025084 Integrated pressure management system for a fuel system Apr. 11, 2006
7004194 Check valve with pressure relief feature Feb. 28, 2006
6948481 Electrical connections for an integrated pressure management apparatus Sep. 27, 2005
6910500 Integrated pressure management system for a fuel system Jun. 28, 2005
6843271 Fuel tank pressure control valve including an integrated sensor Jan. 18, 2005
6840232 Fluid flow through an integrated pressure management apparatus Jan. 11, 2005
6742540 Two-way orifice check valve device for hydraulic circuit Jun. 1, 2004
6701901 Connection between an integrated pressure management apparatus and a vapor collection canister Mar. 9, 2004
6578597 Fuel tank vent system with liquid fuel filter Jun. 17, 2003
6568415 Storing device for easily polymerizable and coagulating liquid substance and method for pressure control thereof May. 27, 2003
6546727 Hydraulic system Apr. 15, 2003
6543473 Damper valve and a hydraulic power steering device using the same Apr. 8, 2003
6502560 Integrated pressure management apparatus having electronic control circuit Jan. 7, 2003
6478045 Solenoid for an integrated pressure management apparatus Nov. 12, 2002
6474313 Connection between an integrated pressure management apparatus and a vapor collection canister Nov. 5, 2002
6474314 Fuel system with intergrated pressure management Nov. 5, 2002
6470861 Fluid flow through an integrated pressure management apparatus Oct. 29, 2002

1 2 3 4










 
 
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