G - Physics – 05 – D
Patent
G - Physics
05
D
236/1
G05D 23/00 (2006.01) F16K 31/12 (2006.01) F16K 49/00 (2006.01)
Patent
CA 1215697
VALVE OPERATOR CONTROL SYSTEM 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 pre- determined bias forcing the valve against the seat due to the spring forces in spite of thermal expansion of the valve, its seat and stem.
450736
Phillips Larry J.
Stinson Walter J.
Borden Ladner Gervais Llp
General Signal Corporation
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