Valve with remote and manual actuation means
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United States of America Patent
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-
Feb 11, 1986
Grant Date -
N/A
app pub date -
Feb 26, 1985
filing date -
Feb 26, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An actuator for moving the stem (9) of a gate valve or the like is provided with hydraulic means (15,17) for driving the stem (9) axially inward and a volute spring (7) for returning the stem axially outward upon loss or other removal of the control hydraulic pressure. A ball screw (49) and ball nut (54) assembly rotatable by a disengageable drive shaft (63) is operable to manually drive the stem (9) inward during periods of insufficient control pressure.
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