Valve actuator system

Details Valve actuator system Valve actuator system

1978-08-28

1980-08-05

Schwadron, Martin P.

Valves and valve actuation

Fluid actuated or retarded

Pilot or servo type motor

91 20, 91 31, 91 33, 91388, F16K 31128

Patent

active

042158443

ABSTRACT:
A pneumatic-hydraulic proportional valve actuator system is provided having a relatively simple and adjustable means of achieving two stroking speeds by the hydraulic actuator, high speed in normal operation and low speed for small position adjustments and for the final part of any large position adjustments. This prevents overshoot and instability of the actuator.

REFERENCES:
patent: 2649841 (1953-08-01), Jacques
patent: 2974639 (1961-03-01), O'Connor et al.
patent: 3433126 (1969-03-01), Hayner et al.
patent: 3468126 (1969-09-01), Mercier
patent: 3872773 (1975-03-01), Denker
patent: 4037519 (1977-07-01), Miller et al.
patent: 4043533 (1977-08-01), Cowley
patent: 4046059 (1977-09-01), Leonard
patent: 4114637 (1978-09-01), Johnson
patent: 4136600 (1979-01-01), Heiser

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