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Class Information
Number: 137/82
Name: Fluid handling > Pressure modulating relays or followers
Description: Apparatus which continuously varies or modulates a fluid in response to a varying control condition. The modulation is usually accompanied by varying a pressure bleed.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7267137 |
Deadweight pressure standards using non-hysteresis sylphons |
Sep. 11, 2007 |
| 7234482 |
Servovalve with torque motor |
Jun. 26, 2007 |
| 7133763 |
Control apparatus for controlling a plant by using a delta-sigma modulation algorithm |
Nov. 7, 2006 |
| 7099235 |
Geophone and method of manufacturing a geophone |
Aug. 29, 2006 |
| 6957656 |
Proportional solenoid valve and control method therefor |
Oct. 25, 2005 |
| 6880800 |
Pressure regulator |
Apr. 19, 2005 |
| 6799598 |
Solenoid valve circuit for automatic transmission |
Oct. 5, 2004 |
| 6796322 |
Hydraulic pressure regulating valve |
Sep. 28, 2004 |
| 6755205 |
Method to stabilize a nozzle flapper valve |
Jun. 29, 2004 |
| 6467496 |
Single-adjustment, dual-null pressure setting for an electrohydraulic valve pilot stage |
Oct. 22, 2002 |
| 6460558 |
Pilot stage or pressure control pilot valve having a single armature/flapper |
Oct. 8, 2002 |
| 6422532 |
Severe service valve positioner |
Jul. 23, 2002 |
| 6397875 |
Pressure regulating method |
Jun. 4, 2002 |
| 6378545 |
Electromagnetically actuatable hydraulic proportional valve |
Apr. 30, 2002 |
| 6295511 |
Apparatus for controlling and monitoring actuators with an open/close characteristic |
Sep. 25, 2001 |
| 6202670 |
Piezoelectric actuated poppet value to modulate pilot pressures and control main valve activation |
Mar. 20, 2001 |
| 6202669 |
Self-aligning valve |
Mar. 20, 2001 |
| 6196249 |
Pressure regulating method and apparatus |
Mar. 6, 2001 |
| 6079435 |
Current to pressure converter |
Jun. 27, 2000 |
| 6032923 |
Fluid valves having cantilevered blocking films |
Mar. 7, 2000 |
| 6019120 |
Single stage variable force solenoid pressure regulating valve |
Feb. 1, 2000 |
| 5967172 |
Electric vacuum regulator valve |
Oct. 19, 1999 |
| 5965950 |
Device for controlling the injection location of washer solution |
Oct. 12, 1999 |
| 5906218 |
Electric-to-pressure converters |
May. 25, 1999 |
| 5873946 |
Installation and a process for lubricating, cleaning and/or disinfecting conveyor belts |
Feb. 23, 1999 |
| 5845667 |
Single stage variable force solenoid pressure regulating valve |
Dec. 8, 1998 |
| 5810329 |
Control system for providing dual vacuum levels |
Sep. 22, 1998 |
| 5699824 |
Electrical-pneumatic system |
Dec. 23, 1997 |
| 5630440 |
Piezo composite sheet actuated valve |
May. 20, 1997 |
| 5617890 |
Electromagnetically operable pressure-regulation valve |
Apr. 8, 1997 |
| 5595209 |
Fluid pressure regulator establishing a stable output fluid pressure |
Jan. 21, 1997 |
| 5593134 |
Magnetically assisted piezo-electric valve actuator |
Jan. 14, 1997 |
| 5513832 |
Variable force solenoid valve |
May. 7, 1996 |
| 5474100 |
Electricity/air pressure converter |
Dec. 12, 1995 |
| 5465757 |
Electro-hydraulic fluid metering and control device |
Nov. 14, 1995 |
| 5443089 |
Hydraulic amplifiers with reduced leakage at null |
Aug. 22, 1995 |
| 5400824 |
Microvalve |
Mar. 28, 1995 |
| 5381817 |
Mechanical flexure for motion amplification and transducer with same |
Jan. 17, 1995 |
| 5318271 |
Piezo valve |
Jun. 7, 1994 |
| 5291915 |
Adjustable pressure relief valve |
Mar. 8, 1994 |
| 5282489 |
Fluid pressure modulator |
Feb. 1, 1994 |
| 5265637 |
Mechanical flexure for motion amplification and transducer with same |
Nov. 30, 1993 |
| 5257639 |
Electropneumatic positioner |
Nov. 2, 1993 |
| 5253676 |
Low Bernoulli force control orifice |
Oct. 19, 1993 |
| 5230362 |
Compensated pressure controller |
Jul. 27, 1993 |
| 5215111 |
Method of performance improvement for an I/P servo |
Jun. 1, 1993 |
| 5207240 |
Self aligning nozzle for a flapper valve |
May. 4, 1993 |
| 5163463 |
Mechanical flexure for motion amplification and transducer with same |
Nov. 17, 1992 |
| 5159949 |
Electropneumatic positioner |
Nov. 3, 1992 |
| 5105729 |
Controlled valve with automatic opening and aircraft with a valve of this type |
Apr. 21, 1992 |
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