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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:
Patents under this class:
| 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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