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Class Information
Number: 137/85
Name: Fluid handling > Pressure modulating relays or followers > With counter-balancing pressure feedback to the modulating device
Description: Apparatus in which the modulated pressure is utilized in a feedback arrangement to counterbalance the modulating control element.










Sub-classes under this class:

Class Number Class Name Patents
137/86 With counter-counter balancing pressure feedback 24


Patents under this class:
1 2 3 4

Patent Number Title Of Patent Date Issued
4453559 Pneumatic controller Jun. 12, 1984
4438662 Automatic control system having manual control engageable at will Mar. 27, 1984
4437483 Fluid-pressure-operable relay valves Mar. 20, 1984
4423747 Pressure regulating valve Jan. 3, 1984
4417599 Vacuum signal integrator Nov. 29, 1983
4388942 Nozzle flapper valve Jun. 21, 1983
4388943 Linkage for moment balancing measuring apparatus Jun. 21, 1983
4375780 Fail-fixed electrohydraulic servosystem Mar. 8, 1983
4369804 Electrohydraulic translation apparatus, in particular permitting control of a pressure in an automatic transmission Jan. 25, 1983
4368750 Ball-type feedback motor for servovalves Jan. 18, 1983
4366670 Vacuum control valve for exhaust gas cleaning system Jan. 4, 1983
4362182 Nozzle force feedback for pilot stage flapper Dec. 7, 1982
4347699 Exhaust cleaning fluid control system and vacuum control valve device for use therein Sep. 7, 1982
4336819 Pneumatic converter Jun. 29, 1982
4332269 Sloped nozzle pneumatic device Jun. 1, 1982
4331179 Regulator/valve controller May. 25, 1982
4329910 Transducer assembly providing position output proportional to electrical input signal May. 18, 1982
4327762 Control device and method of making the same May. 4, 1982
4325427 Dual thermostat control apparatus with dead band response Apr. 20, 1982
4325399 Current to pressure converter apparatus Apr. 20, 1982
4318509 Fluid temperature control system Mar. 9, 1982
4316479 Vacuum modulator valve and subassembly therefor Feb. 23, 1982
4315521 Fluid pressure signal controller Feb. 16, 1982
4314578 Fluid signal transmitting apparatus Feb. 9, 1982
4310201 Adaptive traction pressure regulator Jan. 12, 1982
4290441 Control device and method of making the same Sep. 22, 1981
4285357 Pneumatic relay Aug. 25, 1981
4285358 Servovalve feedback wire interface configuration Aug. 25, 1981
4273150 Leverless pressure transducer Jun. 16, 1981
4271859 Temperature sensor Jun. 9, 1981
4267855 Pneumatic vacuum regulator May. 19, 1981
4263838 Pneumatic positioner Apr. 28, 1981
4253604 Pneumatic control means for a vehicle heat exchanger system or the like Mar. 3, 1981
4253603 Temperature responsive control apparatus Mar. 3, 1981
4231385 Pneumatic controller Nov. 4, 1980
4219042 Pneumatic relay Aug. 26, 1980
4213478 Transducer assembly providing pneumatic output proportional to electrical input signal Jul. 22, 1980
4209030 Control device Jun. 24, 1980
4207914 Fluid relay apparatus Jun. 17, 1980
4201336 Fluidic square root extractor May. 6, 1980
4192453 Thermostat construction and method of making the same Mar. 11, 1980
4191091 Feathering valve assembly Mar. 4, 1980
4173150 Sensor with adjustable pressure responsive detection and control Nov. 6, 1979
4172464 Vibration resistant flapper and nozzle Oct. 30, 1979
4169485 Method of operating a control system Oct. 2, 1979
4154160 Pressure control device for a processing machine with rolls May. 15, 1979
4151856 Fluid pressure relay and output booster May. 1, 1979
4126152 Pressure reproducing relay Nov. 21, 1978
4112960 Variable-gradient spring sub-assembly Sep. 12, 1978
4099539 Control system and control device therefor Jul. 11, 1978

1 2 3 4










 
 
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