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Class Information
Number: 251/31
Name: Valves and valve actuation > Fluid actuated or retarded > Pilot or servo type motor > Double or oppositely acting motor units
Description: Subject matter in which the main valve is operated in one direction by a servo unit and another direction by a second servo unit.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7328817 |
Device for dispensing a heated liquid |
Feb. 12, 2008 |
| 7063517 |
Valve apparatus and pneumatically driven diaphragm pump incorporating same |
Jun. 20, 2006 |
| 7025325 |
Flow control valve |
Apr. 11, 2006 |
| 7011289 |
Valve |
Mar. 14, 2006 |
| 6991210 |
Actuator for driving a valve |
Jan. 31, 2006 |
| 6983803 |
Equalizer valve and associated method for sealing a fluid flow |
Jan. 10, 2006 |
| 6974114 |
Double valve flusher |
Dec. 13, 2005 |
| 6953047 |
Cabinet for chemical delivery with solvent purging |
Oct. 11, 2005 |
| 6860464 |
Electromechanical/pneumatic rocket engine valve actuator |
Mar. 1, 2005 |
| 6854478 |
Fluid-controlled valve for pipeline pig |
Feb. 15, 2005 |
| 6840494 |
Gate valve with flow-through gate |
Jan. 11, 2005 |
| 6830229 |
Two-stage valve suitable as high-flow high-pressure microvalve |
Dec. 14, 2004 |
| 6729302 |
Fuel injection system for an internal-combustion engine |
May. 4, 2004 |
| 6719263 |
Multi-piston valve actuator |
Apr. 13, 2004 |
| 6672088 |
Self-contained regulating valve, and compression type refrigerating machine having the same |
Jan. 6, 2004 |
| 6612537 |
Cartridge gate valve |
Sep. 2, 2003 |
| 6557820 |
Two-stage valve suitable as high-flow high-pressure microvalve |
May. 6, 2003 |
| 6453932 |
In-line valve |
Sep. 24, 2002 |
| 6386508 |
Actuator having dual piston surfaces |
May. 14, 2002 |
| 6273135 |
Fuel flow control apparatus |
Aug. 14, 2001 |
| 6202671 |
Control valve for cryogenic liquid propellant |
Mar. 20, 2001 |
| 6173938 |
Two speed air cylinder for slit valve motion control |
Jan. 16, 2001 |
| 6173740 |
Highly versatile fluid-actuated valve control actuator |
Jan. 16, 2001 |
| 6170524 |
Fast valve and actuator |
Jan. 9, 2001 |
| 6155531 |
Proportional control value |
Dec. 5, 2000 |
| 6102363 |
Actuator for reciprocating air driven devices |
Aug. 15, 2000 |
| 6102362 |
Gas motor actuator |
Aug. 15, 2000 |
| 6085777 |
Dual cylinder insertion apparatus |
Jul. 11, 2000 |
| 6062534 |
Double acting rotary valve actuator |
May. 16, 2000 |
| 6029693 |
Valve driving apparatus |
Feb. 29, 2000 |
| 5855226 |
Valve actuator |
Jan. 5, 1999 |
| 5713315 |
Multiple step valve opening control system |
Feb. 3, 1998 |
| 5661998 |
Three-position actuator piston assembly and actuator system utilizing same |
Sep. 2, 1997 |
| 5555910 |
Pressure relief valves adapted for low pressure operation |
Sep. 17, 1996 |
| 5527160 |
Mechanical shift, pneumatic assist pilot valve |
Jun. 18, 1996 |
| 5447285 |
Safety device for cylinder valve automatic switching unit |
Sep. 5, 1995 |
| 5429153 |
Hydraulic actuator for isolators |
Jul. 4, 1995 |
| 5427350 |
Electrically-operated control valve and water distribution system including same |
Jun. 27, 1995 |
| 5415378 |
Valve assembly |
May. 16, 1995 |
| 5386851 |
Two dimensional modulated burner staging valve |
Feb. 7, 1995 |
| 5385328 |
Control valve |
Jan. 31, 1995 |
| 5290118 |
Filing device for storing recording discs |
Mar. 1, 1994 |
| 5275136 |
Variable engine valve control system with hydraulic damper |
Jan. 4, 1994 |
| 5249601 |
Flushing system for hog houses |
Oct. 5, 1993 |
| 5248123 |
Pilot operated hydraulic valve actuator |
Sep. 28, 1993 |
| 5224684 |
Blowback operated fluid valve |
Jul. 6, 1993 |
| 5199684 |
Discharge valve for dissolved air flotation |
Apr. 6, 1993 |
| 5186393 |
On-off valves and pressure regulators for high-pressure fluids |
Feb. 16, 1993 |
| 5167256 |
Pressure equalizing system and valve with mechanical valve control |
Dec. 1, 1992 |
| 5163351 |
Hydraulic lock cylinder |
Nov. 17, 1992 |
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