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Class Information
Number: 251/73
Name: Valves and valve actuation > Biased trip > Fluid pressure trip actuation
Description: Subject matter wherein the means for actuating the trip includes fluid pressure motive means.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8640729 Method and apparatus for automatic fluid shut-off Feb. 4, 2014
8622070 Valve release mechanism Jan. 7, 2014
8616521 Fail safe retaining plug assembly for a slam-shut safety device Dec. 31, 2013
8579252 Actuator device having an open/close valve Nov. 12, 2013
8573558 Pneumatic actuator air flow control system Nov. 5, 2013
8561640 Latching check valve Oct. 22, 2013
8560139 Automatic flow control apparatus Oct. 15, 2013
8485225 Flow control screen assembly having remotely disabled reverse flow control capability Jul. 16, 2013
8443823 Flood detection and valve shutoff device May. 21, 2013
8267162 Bi-directional pressure relief valve for a plate fin heat exchanger Sep. 18, 2012
8177189 Fire protection control valve with rotating plug May. 15, 2012
8104504 Methods and apparatus for removable lid with ultra fast action speed for relies compressed media, liquid or compressed gas Jan. 31, 2012
7806235 Environmental compressor protection assembly Oct. 5, 2010
7751959 Semi-active suspension system with anti-roll for a vehicle Jul. 6, 2010
7650905 Emergency isolation valve apparatus Jan. 26, 2010
6899122 Safety shutoff apparatus and method May. 31, 2005
6766820 Field adjustable pilot guard Jul. 27, 2004
6543471 Water heater fail safe apparatus Apr. 8, 2003
6460564 Automatic-locking shut-off valve for liquid suction systems Oct. 8, 2002
6311714 Seismic detecting shut-down valve device Nov. 6, 2001
6296008 Switchover valve Oct. 2, 2001
6131876 Valve having a displaceable valve spindle Oct. 17, 2000
6047732 Directional control valve Apr. 11, 2000
5628490 Control valve with pneumatic actuation May. 13, 1997
5575306 Relief valve trigger for relatively large diameter fluid pressure containers Nov. 19, 1996
5439028 Modular valve for a building standpipe Aug. 8, 1995
5351714 Safety valve for high-pressure pumps, high-pressure water-jet machines and the like Oct. 4, 1994
5297775 Linkage arrangement for steam turbine valves Mar. 29, 1994
5295403 Mechanical actuator Mar. 22, 1994
5261446 Self-contained emergency shutdown valve Nov. 16, 1993
5117867 Manifold for a differential pressure transmitter Jun. 2, 1992
5048791 Shut off valve Sep. 17, 1991
4862919 Hydraulic control system for a multi-position valve Sep. 5, 1989
4700925 Pressure medium operated servomotor arrangement Oct. 20, 1987
4671353 Apparatus for releasing a cementing plug Jun. 9, 1987
4665945 Pressure regulator for a fuel gas May. 19, 1987
4653522 Ground hydrant and method for operating same Mar. 31, 1987
4589496 Fire suppressant valve using a floating poppet May. 20, 1986
4566478 Well safety and kill valve Jan. 28, 1986
4561630 Valve Dec. 31, 1985
4523602 Pressure controller Jun. 18, 1985
4511117 Activating apparatus in a liquid conveying system operated by vacuum, preferably a so-called vacuum sewage system Apr. 16, 1985
4503717 Shock actuated unit Mar. 12, 1985
4474242 Annulus pressure controlled reversing valve Oct. 2, 1984
4457334 Pressure sensitive valve actuator Jul. 3, 1984
4420044 Flow control system Dec. 13, 1983
4392812 Control circuit for gasified liquid fuel combustion apparatus Jul. 12, 1983
4309022 Poppet valve actuator apparatus Jan. 5, 1982
4286768 Stepped pressure gas valve apparatus Sep. 1, 1981
4180241 Solenoid operated valve and shut-off device Dec. 25, 1979

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