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Class Information
Number: 137/496
Name: Fluid handling > Line condition change responsive valves > With separate connected fluid reactor surface > Valve closes in responses to reverse flow
Description: Apparatus in which the flow controlling valve is disclosed or claimed as being closed in response to the reversal of the fluid flow or to its tendency toward reversal.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8671974 Flow-actuated actuator and method Mar. 18, 2014
8557454 Fuel cell system and reverse flow relief valve Oct. 15, 2013
8464795 Annulus isolation valve Jun. 18, 2013
8262057 Flow controlled actuator apparatus for use with self-closing stop valves Sep. 11, 2012
8069926 Method of controlling flow through a drill string using a valve positioned therein Dec. 6, 2011
7506662 One-way fluid valve Mar. 24, 2009
7464722 Fluid proportioning valve Dec. 16, 2008
6834671 Check valve for micro electro mechanical structure devices Dec. 28, 2004
6810914 Method and arrangement to accomplish a one-way flow Nov. 2, 2004
6748971 Discharge valve assembly of fluid machinery Jun. 15, 2004
6681418 Water flow control device Jan. 27, 2004
6546954 Flow control valve Apr. 15, 2003
6240943 Method and apparatus for maintaining a constant ratio of gases in a mixture subject to steady state and intermittent flow conditions Jun. 5, 2001
6145309 Method for controlling the steering volume flow of a hydraulic power-assisted steering unit for motor vehicles Nov. 14, 2000
6116270 Piston valve Sep. 12, 2000
5988217 Shutoff-opening device Nov. 23, 1999
5896882 Pressure control valve Apr. 27, 1999
5720433 Draw back valve for a glue gun Feb. 24, 1998
5691753 Valving connector and ink handling system for thermal ink-jet printbar Nov. 25, 1997
5636661 Self-piloting check valve Jun. 10, 1997
5553756 Dispenser with pressure operated, spring biased, reciprocating piston valve Sep. 10, 1996
5479988 Mud check valves in drilling apparatus (wells) Jan. 2, 1996
5390698 Plate-type, unidirectional-flow, fluid control valve Feb. 21, 1995
5295506 Flow control apparatus Mar. 22, 1994
5161571 Check valve Nov. 10, 1992
5120210 Core structure for producing closed end sleeve Jun. 9, 1992
5107885 Check valve Apr. 28, 1992
5036879 Pulsation dampener and flow check apparatus Aug. 6, 1991
4922955 Fluid flow control device May. 8, 1990
4901757 One way valve Feb. 20, 1990
4776838 Three stage valve Oct. 11, 1988
4660596 Inside B.O.P. valve Apr. 28, 1987
4593720 Filling nozzle valve structure Jun. 10, 1986
4522230 Orifice plate seal ring for controlled closure check valve Jun. 11, 1985
4518007 Automatic hot water recovery system May. 21, 1985
4494563 Fluid safety valve Jan. 22, 1985
4489750 Pressure operated pulsatile fluid flow device Dec. 25, 1984
4458717 Cylinder cushion seal Jul. 10, 1984
4422503 Control line blow out preventer Dec. 27, 1983
4392512 Relief valve Jul. 12, 1983
4332274 Disconnector for drinking water distribution system Jun. 1, 1982
4291722 Drill string safety and kill valve Sep. 29, 1981
4286573 Water heater heat trap assembly Sep. 1, 1981
4282896 Pilot operated check valve Aug. 11, 1981
4282896 Pilot operated check valve Aug. 11, 1981
4263936 Erosion resistant check valve assembly Apr. 28, 1981
4256137 Check valve Mar. 17, 1981
4249556 Isolating and backflow preventing valve assembly Feb. 10, 1981
4241756 Exhalation valve assembly Dec. 30, 1980
4220176 Methods and apparatus for controlling fluid flow Sep. 2, 1980

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