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Class Information
Number: 137/629
Name: Fluid handling > Systems > Sequentially progressive opening or closing of plural valves > Pressure equalizing or auxiliary shunt flow
Description: Subject matter in which the valves are located in flow passages which are connected in parallel.










Sub-classes under this class:

Class Number Class Name Patents
137/630 One valve seats against other valve (e.g., concentric valves) 54


Patents under this class:

Patent Number Title Of Patent Date Issued
8534317 Hydraulically controlled barrier valve equalizing system Sep. 17, 2013
8506692 Valves capable of controlling valve-opening area Aug. 13, 2013
8302630 Gate valve with equalizer port Nov. 6, 2012
7287551 Gas control valve Oct. 30, 2007
7048005 Throttle valve device for a pneumatic power tool May. 23, 2006
6637477 Filler neck for the fuel tank of a motor vehicle Oct. 28, 2003
6612338 Fuel tank pressure control valve Sep. 2, 2003
6237693 Failsafe safety valve and method May. 29, 2001
6230739 Fuel refilling assembly May. 15, 2001
6227236 Widely variable conductance valve May. 8, 2001
6131612 Valve for a superheated-steam conversion plant Oct. 17, 2000
5975212 Surface controlled subsurface safety valve downstop seal Nov. 2, 1999
5894856 Seismically triggered valve Apr. 20, 1999
5890698 Valve having pressure equalizing conduit Apr. 6, 1999
5832950 Fuel interruption means of fuel tank Nov. 10, 1998
5549138 Changeover valve system Aug. 27, 1996
5518024 Overfill prevention device for storage tanks May. 21, 1996
5390703 Valve for flowing liquid-phase medium Feb. 21, 1995
5337788 Pneumatic valve with slow start and quick exhaust Aug. 16, 1994
5174335 Bidirectional vacuum valve Dec. 29, 1992
5070707 Shockless system and hot gas valve for refrigeration and air conditioning Dec. 10, 1991
5066186 Dust discharging apparatus for a furnace Nov. 19, 1991
4974624 Gas shut-off device Dec. 4, 1990
4903802 Slide type exhaust brake Feb. 27, 1990
4796667 Brake pressure control valve Jan. 10, 1989
4749036 Dual bore well treating tool Jun. 7, 1988
4615354 Valve system timing device for pipes carrying liquid under pressure Oct. 7, 1986
4579177 Subsurface solenoid latched safety valve Apr. 1, 1986
4575045 Rotary cock with generally spherical valve member Mar. 11, 1986
4452311 Equalizing means for well tools Jun. 5, 1984
4415037 Ball valve loading apparatus Nov. 15, 1983
4407329 Magnetically operated fail-safe cutoff valve with pressure equalizing means Oct. 4, 1983
4368871 Lubricator valve apparatus Jan. 18, 1983
4340088 Pressure balanced safety valve for wells and flow lines Jul. 20, 1982
4325434 Tubing shut off valve Apr. 20, 1982
4293038 Ball valve assembly Oct. 6, 1981
4244398 Check valve assembly having valve opening prior to passing flow and flow shut off prior to valve closing Jan. 13, 1981
4228988 Valve Oct. 21, 1980
4197879 Lubricator valve apparatus Apr. 15, 1980
4177833 Valves having a pressure equalizer across dual face seals Dec. 11, 1979
4151862 Multiple-mode fluid-flow control valve arrangement May. 1, 1979
4140153 Subsurface safety valve Feb. 20, 1979
4134454 Multi-stage sliding valve fluid operated and pressure balanced Jan. 16, 1979
4103744 Safety valve and ball type equalizing valve Aug. 1, 1978
4100969 Tubing tester valve apparatus Jul. 18, 1978
4073315 Valve assembly Feb. 14, 1978
3999574 Hydraulic safety stop-valve Dec. 28, 1976











 
 
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