Valve with remote and manual actuation means

Details Valve with remote and manual actuation means Valve with remote and manual actuation means

1985-02-26

1986-02-11

Rosenthal, Arnold

Valves and valve actuation

Fluid actuated or retarded

Fluid and non-fluid actuators

251327, 1375563, 74625, 744248VA, 192 95, F16K 31143

Patent

active

045695032

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.

REFERENCES:
patent: 2738945 (1956-03-01), Shafer
patent: 3378224 (1968-04-01), Boyle
patent: 3789875 (1974-02-01), McGee
patent: 4230299 (1980-10-01), Pierce, Jr.

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