Apparatus for moving a controlled member to a predetermined posi

Details Apparatus for moving a controlled member to a predetermined posi Apparatus for moving a controlled member to a predetermined posi

1983-10-03

1985-07-09

Walton, George L.

Valves and valve actuation

Fluid actuated or retarded

Fluid and non-fluid actuators

74 25, 74 40, 92 94, 92129, 92130R, 251 58, 251 614, 251229, 251279, F16K 31145

Patent

active

045277699

ABSTRACT:
A fail-safe actuator of the type which permits cycling of a control member during normal operation without encumbrance from a return mechanism includes a link having a slot. A pin secured to a crankshaft coupled to the controlled member is slidably disposed within the slot. The slot permits rotation of the crankshaft within a range defined by the slot length. Upon system failure, a fluid pressure is moved to a predetermined position by a biasing spring to force the crankshaft to a fail-safe position.

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