Valves and valve actuation – Fluid actuated or retarded – Fluid and non-fluid actuators
Patent
1987-01-28
1987-09-08
Tapolcai, William E.
Valves and valve actuation
Fluid actuated or retarded
Fluid and non-fluid actuators
74625, 137 79, 137456, 137553, F16K 3114, F16K 3160
Patent
active
046918930
ABSTRACT:
There are disclosed several embodiments of a fail safe gate valve and actuator having means for yieldably urging the gate from one position to which it is moved under one or more controlled conditions to its other position upon failure of one such condition, means including a handwheel mounted on the actuator for moving the gate to its one position, and means automatically responsive to a control signal for rendering the handwheel inoperative to move the gate to its one position upon reestablishment of said one controlled condition. In certain embodiments, the control signal is automatically responsive to the reestablishment of said one controlled condition; and, in another embodiment, it is automatically responsive to the failure of said one controlled condition. The controlled conditions are disclosed as being one or both of a predetermined fluid pressure condition, and or a predetermined environmental temperature condition.
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Akkerman Neil H.
Vazquez Gonzalo
AVA International Corporation
Tapolcai William E.
LandOfFree
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