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Class Information
Number: 137/489
Name: Fluid handling > Line condition change responsive valves > Pilot or servo controlled > Fluid pressure type > Choked or throttled pressure type
Description: Apparatus which includes a pressure chamber having both a valved passage and an unvalved passage for ingress and egress of fluid, the relative sizes of the passages being such that a different pressure may be maintained in the chamber when the valve passage is open than is the case when it is closed.

Sub-classes under this class:

Class Number Class Name Patents
137/491 Choked passage through main valve head 107
137/489.3 Loose fitting piston 6
137/489.5 Pilot controls supply to pressure chamber 88
137/490 Pilot valve within main valve head 29

Patents under this class:
1 2 3 4

Patent Number Title Of Patent Date Issued
8631819 Gas supply system for pneumatic store ejection utilizing a removable, replaceable and on-board rechargeable gas storage vessel Jan. 21, 2014
8550101 System and method for hydraulically managing fluid pressure downstream from a main valve between set points Oct. 8, 2013
8387653 Diaphragm valve with electronic pressure detection Mar. 5, 2013
8360095 High-pressure valve Jan. 29, 2013
8276612 System and method for hydraulically managing fluid pressure downstream from a main valve Oct. 2, 2012
8261770 Diaphragm valve controlled through electronic pressure detection and method Sep. 11, 2012
8215327 Diaphragm valve with electronic pressure detection Jul. 10, 2012
8205765 Gas absorption reservoir with optimized cooling Jun. 26, 2012
8091582 System and method for hydraulically managing fluid pressure downstream from a main valve between set points Jan. 10, 2012
8047226 Pressure relief valves and pneumatic control systems Nov. 1, 2011
8022647 Gas water heater actuator Sep. 20, 2011
7703477 Fluid control valve Apr. 27, 2010
7647941 Air pulser Jan. 19, 2010
7578310 Pressure controller device Aug. 25, 2009
7523762 Modulating gas valves and systems Apr. 28, 2009
7249610 Ratio controller with dynamic ratio formation Jul. 31, 2007
7234483 Electro-pneumatic air pressure regulator Jun. 26, 2007
7121297 Valve arrangement in a hydraulic circuit, use of the same and arrangement for controlling a hydraulic vehicle drive Oct. 17, 2006
7069945 Cartridge relief valve with improved stability Jul. 4, 2006
7066203 Gas flow control Jun. 27, 2006
7044011 Test fixture assembly for directional pilot valve and related method May. 16, 2006
6997165 Pressure control valve for a fuel system Feb. 14, 2006
6935362 Pilot valve Aug. 30, 2005
6923204 Diaphragm-operated fluid flow control valve providing a plurality of flow levels Aug. 2, 2005
6916002 Structural improvement of membrane valve Jul. 12, 2005
6910496 Gas conversion assembly Jun. 28, 2005
6892745 Flow control valve with integral sensor and controller and related method May. 17, 2005
6832628 Variable pressure regulated flow controllers Dec. 21, 2004
6805155 Cartridge relief valve with improved stability Oct. 19, 2004
6802339 Assembly having a spring-loaded tandem control valve Oct. 12, 2004
6786225 Three-stage relay control Sep. 7, 2004
6772785 Demand valve for breathing apparatus Aug. 10, 2004
6772786 Self-contained hydraulic ESD system Aug. 10, 2004
6772787 Vacuum regulator for maintaining a substantially constant vacuum in a vacuum system Aug. 10, 2004
6705342 Modulating gas valve with natural/LP gas conversion capability Mar. 16, 2004
6644346 Spring-loaded tandem control valve Nov. 11, 2003
6604538 Adjustable fluid flow regulator with adjustment limit Aug. 12, 2003
6595237 Pressure regulator for gas transport and distribution plants Jul. 22, 2003
6554017 Pressure regulating valve with secondary venting measures Apr. 29, 2003
6398182 Pilot solenoid control valve with an emergency operator Jun. 4, 2002
6394412 Controlled valve May. 28, 2002
6354319 Low differential, pilot operated fluid pressure regulation apparatus and method Mar. 12, 2002
6325088 Buckling pin actuated, pilot operated pressure relief valve Dec. 4, 2001
6283145 Proportional control gas valve Sep. 4, 2001
6263908 Slow opening gas valve Jul. 24, 2001
6263909 Valve assembly Jul. 24, 2001
6250330 Diaphragm regulator with removable diffuser Jun. 26, 2001
6220280 Pilot operated relief valve with system isolating pilot valve from process media Apr. 24, 2001
6209577 Modulating action non-flowing pilot operated relief valve Apr. 3, 2001
6173735 Method and apparatus for regulating gas flow Jan. 16, 2001

1 2 3 4

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