Valve operator control system

Details Valve operator control system Valve operator control system

1983-04-28

1985-05-21

Walton, George L.

Valves and valve actuation

Fluid actuated or retarded

Pilot or servo type motor

91388, 744248VA, F16K 31128

Patent

active

045181462

ABSTRACT:
A control system for a valve actuator which is subject to oppositely directed displacement due to thermal expansion and spring forces has sensor switches which detect successively greater amounts of compression of a spring which compresses to accommodate thermal expansion of the valve, its stem and seat when the valve is seated in closed position. A position servomechanism which is responsive to the position of the stem and a control signal operates a motor for advancing and retracting the stem. Separate control devices, which are two way valves when the motor is a fluid motor and the servomechanism is a fluid operative servomechanism, are controlled by the sensor switches to stop the motor from overcompressing the spring when first position of the spring is reached and to operate the motor to retract the valve back to the first position when the second position is reached whereby to maintain a predetermined bias forcing the valve against the seat due to the spring forces in spite of thermal expansion of the valve, its seat and stem.

REFERENCES:
patent: 2933937 (1960-04-01), Kron et al.
patent: 4043533 (1977-08-01), Cowley
patent: 4063707 (1977-12-01), Zouzoulas
patent: 4215844 (1980-08-01), Bowen
patent: 4335867 (1982-06-01), Bihlmaier

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