Fluid handling – Distribution systems involving geographic features
Patent
1987-04-22
1989-03-07
Rivell, John
Fluid handling
Distribution systems involving geographic features
251 14, 251 62, 251 635, 92 60, F16K 3114
Patent
active
048097330
ABSTRACT:
A fail-safe gate valve assembly having a power actuator and a spring actuator disposed on opposite sides of a flowline. The assembly includes a valve body, a valve chamber including a gate movable between open and closed positions for controlling fluids through the flowline, a first housing containing the power actuator disposed on one side of the valve body and a second housing containing the spring actuator disposed on the opposite side of the valve body. The power actuator urges the gate from one to another of the positions. The spring actuator urges the gate from the other to the one of the positions in event a power loss occurs to the power actuator. The spring actuator may include an override thereby allowing the override to be used to open and close the gate valve without compressing the springs.
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Bunyard R. J.
Fillnow L. A.
Johnson R. H.
National-Oilwell
Rivell John
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