Valves and valve actuation – Fluid actuated or retarded – Pilot or servo type motor
Patent
1977-10-06
1982-06-22
Cohen, Irwin C.
Valves and valve actuation
Fluid actuated or retarded
Pilot or servo type motor
60388, 60403, 60406, 91 6, 91 31, 91358R, 91360, 13762563, 91388, F15B 13042, F15B 1316, F16K 3112
Patent
active
043358675
ABSTRACT:
An actuator system is disclosed which modulates a linear output shaft associated with a working control valve or the like in response to a control signal input. The system includes a feedback control link, a pneumatic positioner, a pneumatically controlled hydraulic valving system and a hydraulic cylinder and piston assembly controlled by the hydraulic valving system. The hydraulic valving system includes a three-position, four-way valve actuated by pneumatic binary output signals from a signal conditioner which is in turn controlled by the positioner. Hydraulic flow to the three-position, four-way valve may also be controlled from the signal conditioner in response to positioner output for most effective actuation of the hydraulic cylinder and piston assembly. Failure modes are also disclosed with the present system. The resulting system exhibits extremely rapid response times and high accuracy with dynamic stability.
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