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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:

Class Number Class Name Patents
137/83 Jet control type 53
137/84 Plural series units 48
137/85 With counter-balancing pressure feedback to the modulating device 166


Patents under this class:
1 2 3 4

Patent Number Title Of Patent Date Issued
8621778 Modulator Jan. 7, 2014
8528583 Pneumatic amplifier and arrangement for regulating a regulating armature of a process plant Sep. 10, 2013
8454126 Print head with electromagnetic valve assembly Jun. 4, 2013
8408230 Temperature compensated I/P converter Apr. 2, 2013
8196595 Safety override circuit for pneumatic positioner and method of use thereof Jun. 12, 2012
8104495 Versatile emergency shutdown device controller implementing a pneumatic test for a system instrument device Jan. 31, 2012
7802585 Transducer of an electrical input signal into pneumatic output signals Sep. 28, 2010
7645418 Gas washing device Jan. 12, 2010
7621293 Versatile emergency shutdown device controller implementing a pneumatic test for a system instrument device Nov. 24, 2009
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
6202669 Self-aligning valve Mar. 20, 2001
6202670 Piezoelectric actuated poppet value to modulate pilot pressures and control main valve activation 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

1 2 3 4










 
 
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