Fail-safe valve actuator
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United States of America Patent
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-
Feb 17, 1987
Issued Date -
N/A
app pub date -
May 29, 1985
filing date -
Feb 26, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A fail-safe valve actuator includes a hydraulic piston (17) and cylinder (15) for driving the valve stem (9) and gate member (35) of a gate valve into a first flow control state responsive to sufficient pressure delivered by a fluid or gas supply line (92). Upon failure or other loss of sufficient control line pressure, a volute spring (7) drives the cylinder (15), and hence the stem (9) and gate member (35), axially outward resulting in the valve being moved into a second flow control state.
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