Fluid handling – Destructible or deformable element controlled – Heat destructible or fusible
Reexamination Certificate
2007-11-13
2007-11-13
Rivell, John (Department: 3753)
Fluid handling
Destructible or deformable element controlled
Heat destructible or fusible
C137S075000, C251S014000
Reexamination Certificate
active
11364840
ABSTRACT:
An apparatus and method for manual operation of an actuator is disclosed. A mechanical override includes a housing coupled to the actuator, a drive ring, and a shaft extending through a bore of the housing. The drive ring rotationally keys to the bore such that the drive ring is capable of axial movement within the bore in response to automatic operation of the actuator. A backstop limits axial movement of the drive ring during manual operation. A thread located on an external portion of the shaft threads to the drive ring. In the manual operation, the shaft rotates through the drive ring imparting axial movement to the shaft capable of moving a valve between a first position and a second position. The override provides visual indication of the valve position during both automatic and manual operation. The backstop may be an insert that selectively permits movement of the shaft to a failsafe position in response to a temperature or pressure change.
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Axelson Condensed Catalog, Catalog AD-241, pp. 1-10 and 15-24, 1988, U.S.A.
WellGuard PWG-10 Pneumatic Piston Actuator With Internal Override, Emerson Process Management, Bettis Bulletin, #49.30, Rev: 0/02, pp. 1-6, 2002.
Rivell John
Safoco, Inc.
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