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Class Information
Number: 251/30.02
Name: Valves and valve actuation > Fluid actuated or retarded > Pilot or servo type motor > Electrically actuated pilot valve > Main valve biased closed by fluid pressure
Description: Subject matter in which force per unit area exerted by a fluent material is used to maintain the valve in a position which closes a passage to fluid flow until the valve actuator moves for valve to a position which opens the passage.










Sub-classes under this class:

Class Number Class Name Patents
251/30.05 Fluid pressure sole means for biasing valve closed 133
251/30.03 Venting passage within movable main valve 150


Patents under this class:
1 2 3 4 5

Patent Number Title Of Patent Date Issued
8689829 Fluid flow monitor Apr. 8, 2014
8646748 Pressure regulator Feb. 11, 2014
8644996 Positioner Feb. 4, 2014
8631819 Gas supply system for pneumatic store ejection utilizing a removable, replaceable and on-board rechargeable gas storage vessel Jan. 21, 2014
8597849 Pressure activated shut-off valve Dec. 3, 2013
8556228 Enclosures for automatic bathroom flushers Oct. 15, 2013
8540207 Fluid flow control assembly Sep. 24, 2013
8528590 Combination solenoid check valve Sep. 10, 2013
8505566 Valve glue diverter Aug. 13, 2013
8490646 Diaphragm valve with mechanical pressure relief Jul. 23, 2013
8485496 Electronic flush valve with optional manual override Jul. 16, 2013
8444110 Valve arrangement May. 21, 2013
8381760 Stepper motor valve and method of control Feb. 26, 2013
8261770 Diaphragm valve controlled through electronic pressure detection and method Sep. 11, 2012
8256739 Poppet valve operated by an electrohydraulic poppet pilot valve Sep. 4, 2012
8235352 Diaphragm valve for irrigation systems Aug. 7, 2012
8220774 Proportional pilot acting valve Jul. 17, 2012
8156742 Fuel-injection device in a turbomachine Apr. 17, 2012
8104264 Low minimum impulse bit propellant gas thruster Jan. 31, 2012
8096522 Pressure regulator for gaseous media Jan. 17, 2012
8087637 Self-regulating valve for controlling the gas flow in high pressure systems Jan. 3, 2012
7913973 Reverse flow fueldraulic valve Mar. 29, 2011
7905467 Dual position pilot operated valve assembly Mar. 15, 2011
7841582 Variable seal pressure slit valve doors for semiconductor manufacturing equipment Nov. 30, 2010
7823633 Valve apparatus Nov. 2, 2010
7815162 Valve arrangement Oct. 19, 2010
7694934 Diaphragm valve for irrigation systems Apr. 13, 2010
7690622 Diaphragm-type electromagnetic valve with closing-force strengthening mechanism Apr. 6, 2010
7677527 Dual position pilot operated valve assembly Mar. 16, 2010
7669830 Three position shutoff valve Mar. 2, 2010
7600737 Cutback poppet valve Oct. 13, 2009
7520487 Valve arrangement with piezoelectric control Apr. 21, 2009
7475863 Piston for reverse flow diaphragm valve Jan. 13, 2009
7445163 Suck back valve Nov. 4, 2008
7357367 Embedded high temperature valve Apr. 15, 2008
7258058 Metering valve with integral relief and makeup function Aug. 21, 2007
7083156 Automatic proximity faucet with override control system and method Aug. 1, 2006
7028975 Flush valve structure Apr. 18, 2006
7007916 Low flow valve improvement Mar. 7, 2006
6994107 Easy-to-install, mechanically-operated automatic/manual device for controlling an outlet for water or any fluid Feb. 7, 2006
6991211 Pneumatically actuated valve Jan. 31, 2006
6986497 Thruster gas control mechanism Jan. 17, 2006
6971232 Hydraulic drive system and improved control valve assembly therefor Dec. 6, 2005
6962318 Pulsed input shutoff valve Nov. 8, 2005
6955331 Axial valve Oct. 18, 2005
6945507 Gas flow control Sep. 20, 2005
6932316 Ferromagnetic/fluid valve actuator Aug. 23, 2005
6916002 Structural improvement of membrane valve Jul. 12, 2005
6911062 Filter assembly utilizing dual filter elements and a pressure responsive member to provide differential pressure actuated switchover Jun. 28, 2005
6902143 Manual override assembly for pilot-operated valve Jun. 7, 2005

1 2 3 4 5










 
 
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