Servo valve control system

Details Servo valve control system Servo valve control system

1972-08-03

1976-10-26

Cohan, Alan

Valves and valve actuation

Fluid actuated or retarded

Pilot or servo type motor

251 42, 251 44, 251 38, F16K 31363

Patent

active

039879984

ABSTRACT:
A hydraulic servo valve assembly and a control system therefor employing a pneumatic sensor-actuator are disclosed. The servo valve assembly comprises a servo-operated power valve assembly including a differential piston, a solenoid operated override and hysteresis adjustment. The valve assembly is a "snap-action" device wherein the power valve differential piston is selectively positioned through use of the pneumatic sensor controlled servo valve to vent the pressure applied to the larger area reaction surface of the piston.

REFERENCES:
patent: 1132886 (1915-03-01), Stewart
patent: 2637332 (1953-05-01), Longworthy
patent: 3008480 (1961-11-01), Fleming
patent: 3103337 (1963-09-01), Forte

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