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Class Information
Number: 137/492
Name: Fluid handling > Line condition change responsive valves > Pilot or servo controlled > Fluid pressure type > Single acting fluid servo
Description: Apparatus in which the fluid pressure servo-motor operates the flow controlling valve in one direction only, the valve being operated the other direction by a constantly acting pressure or bias.










Sub-classes under this class:

Class Number Class Name Patents
137/492.5 Spring biased 160


Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
8684021 Versatile emergency shutdown device controller implementing a pneumatic test for a system instrument device Apr. 1, 2014
8479734 Overpressure protection system and method for a hyperbaric chamber Jul. 9, 2013
8387653 Diaphragm valve with electronic pressure detection Mar. 5, 2013
8360096 Low pressure rise rate pilot operated poppet relief valve Jan. 29, 2013
8302617 Fluid control valve Nov. 6, 2012
8261770 Diaphragm valve controlled through electronic pressure detection and method Sep. 11, 2012
8215327 Diaphragm valve with electronic pressure detection Jul. 10, 2012
8156960 Servo pressure control valve Apr. 17, 2012
8136545 Apparatus to regulate fluid flow Mar. 20, 2012
8113233 Hydraulic circuit of option device for excavator Feb. 14, 2012
8113228 Suction valve Feb. 14, 2012
8104495 Versatile emergency shutdown device controller implementing a pneumatic test for a system instrument device Jan. 31, 2012
7735513 Diaphragm valve with electronic pressure detection Jun. 15, 2010
7703477 Fluid control valve Apr. 27, 2010
7621293 Versatile emergency shutdown device controller implementing a pneumatic test for a system instrument device Nov. 24, 2009
7025083 Quick closing shut-off valve Apr. 11, 2006
6935363 Pressure control system for low pressure operation Aug. 30, 2005
6843265 Pressure relief system with supply activated valve Jan. 18, 2005
6823785 Printing unit Nov. 30, 2004
6796323 Dual seat valve Sep. 28, 2004
6752168 System for controlling the working conditions for mechanical pumps, and a regulation valve for such a system Jun. 22, 2004
6418956 Pressure controller Jul. 16, 2002
6386228 Pilot device for a safety valve May. 14, 2002
6386227 Non-flowing pilot valve May. 14, 2002
6325088 Buckling pin actuated, pilot operated pressure relief valve Dec. 4, 2001
6318406 Pilot operated relief valve Nov. 20, 2001
6263905 Automatic regulating valve apparatus Jul. 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
6161571 Modulating relief valve Dec. 19, 2000
6135142 Control valve device Oct. 24, 2000
6082390 Gas blanket controller Jul. 4, 2000
6019121 Pressure reducing valve Feb. 1, 2000
5996606 Four-port valve and three-way valve Dec. 7, 1999
5992449 Pilot operated safety relief valve adapted for low fluid pressures Nov. 30, 1999
5909747 Radial flow diaphragm valve Jun. 8, 1999
5890508 Main relief valve for safety relief system Apr. 6, 1999
5842501 Pilot operated safety relief valve Dec. 1, 1998
5762102 Pneumatically controlled no-bleed valve and variable pressure regulator Jun. 9, 1998
5758686 Control valve abnormality detection method and apparatus Jun. 2, 1998
5590684 Dual pilot manifold assembly for a safety relief valve Jan. 7, 1997
5520206 Exhaust reduction system for control valves May. 28, 1996
5398719 Pressure protection installation for a pressure vessel Mar. 21, 1995
5323799 Fully mechanical pressure relief system Jun. 28, 1994
5275202 Adjustable emergency relief vent with surge protection Jan. 4, 1994
5174321 Method and apparatus for determining set pressure of pilot operated pressure relief valve Dec. 29, 1992
5080129 Pilot operated pressure reducing valve Jan. 14, 1992
5000214 Safety device and method Mar. 19, 1991
4974631 Dome pressure maintaining valve Dec. 4, 1990
4958656 Pressure relief valve Sep. 25, 1990

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