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Class Information
Number: 251/25
Name: Valves and valve actuation > Fluid actuated or retarded > Pilot or servo type motor
Description: Subject matter in which the valve is actuated, at least in part, by a fluid pressure motive means deriving its power from either the fluid line or a separate source of fluid pressure and controlled by an auxiliary or pilot valve or valves.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7520487 |
Valve arrangement with piezoelectric control |
Apr. 21, 2009 |
| 7478793 |
Filler spout with opening servo-controlled by a pilot valve |
Jan. 20, 2009 |
| 7370615 |
Variable valve actuator |
May. 13, 2008 |
| 7357367 |
Embedded high temperature valve |
Apr. 15, 2008 |
| 7290509 |
Variable valve actuator |
Nov. 6, 2007 |
| 7213549 |
Variable valve actuator |
May. 8, 2007 |
| 7210502 |
Microvalve device suitable for controlling a variable displacement compressor |
May. 1, 2007 |
| 7000893 |
Servo-valve control device and servo-valve control system with abnormality detection |
Feb. 21, 2006 |
| 6997209 |
Locking device of an air-operated normally-closed valve for a gas cylinder |
Feb. 14, 2006 |
| 6945507 |
Gas flow control |
Sep. 20, 2005 |
| 6771178 |
Method of identifying actuators in a motor-vehicle air-conditioning installation |
Aug. 3, 2004 |
| 6659247 |
Pneumatic volume booster for valve positioner |
Dec. 9, 2003 |
| 6612536 |
Remote shut-off valve |
Sep. 2, 2003 |
| 6607174 |
Dispensing apparatus with in-line actuator |
Aug. 19, 2003 |
| 6601552 |
Hydraulically controllable globe valve |
Aug. 5, 2003 |
| 6491007 |
Hydraulically controllable globe valve |
Dec. 10, 2002 |
| 6398181 |
Valve arrangement |
Jun. 4, 2002 |
| 6382585 |
Valve control system |
May. 7, 2002 |
| 6273135 |
Fuel flow control apparatus |
Aug. 14, 2001 |
| 6237617 |
Isolated proportional valve |
May. 29, 2001 |
| 6209580 |
Multifunction valve assembly |
Apr. 3, 2001 |
| 5875811 |
Counterbalance valve with improved relief pressure setting arrangement |
Mar. 2, 1999 |
| 5809950 |
Hydraulic valve control arrangement |
Sep. 22, 1998 |
| 5765515 |
Controllable hydraulic valve operating mechanism |
Jun. 16, 1998 |
| 5762314 |
Diaphragm valve for cryogenic applications |
Jun. 9, 1998 |
| 5758862 |
Solenoid pump operated valve |
Jun. 2, 1998 |
| 5758683 |
On/off circuit for a hydraulic system |
Jun. 2, 1998 |
| 5671774 |
Rate-of-flow control valve |
Sep. 30, 1997 |
| 5595148 |
Hydraulic valve control device |
Jan. 21, 1997 |
| 5577532 |
Valve actuator |
Nov. 26, 1996 |
| 5505227 |
Faucet control device |
Apr. 9, 1996 |
| 5496009 |
Valve |
Mar. 5, 1996 |
| 5462252 |
Spill valve for a fuel pump |
Oct. 31, 1995 |
| 5427312 |
Thermostatic mixing valve and method of use thereof |
Jun. 27, 1995 |
| 5375619 |
Protective circuit for pressure and return |
Dec. 27, 1994 |
| 5353685 |
Redundant fluidic multiplexer |
Oct. 11, 1994 |
| 5348269 |
Inline pneumatic/mechanical flow control valve system |
Sep. 20, 1994 |
| 5269141 |
Hydraulic safety and regulating system |
Dec. 14, 1993 |
| 5178177 |
Gas saving back pressure device |
Jan. 12, 1993 |
| 5156080 |
Control valve for a hydraulic elevator |
Oct. 20, 1992 |
| 5143256 |
Gas accumulator and blaster apparatus |
Sep. 1, 1992 |
| 5060694 |
Filler spool valve |
Oct. 29, 1991 |
| 5056555 |
Device for protection against an excess pressure |
Oct. 15, 1991 |
| 4923167 |
Slide valve with dosage regulation means |
May. 8, 1990 |
| 4887630 |
Pneumatic control system for air handling system damper |
Dec. 19, 1989 |
| 4869460 |
Actuating device for pipe-chamber feeders of hydraulic transport equipments |
Sep. 26, 1989 |
| 4815694 |
High speed, high volume gas pulse generator |
Mar. 28, 1989 |
| 4805681 |
Control valve for influencing the tire pressure of a vehicle wheel |
Feb. 21, 1989 |
| 4805872 |
Shaping turret |
Feb. 21, 1989 |
| 4794940 |
Plural diaphragm valve |
Jan. 3, 1989 |
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