Valves and valve actuation – Fluid actuated or retarded – Fluid and non-fluid actuators
Patent
1981-02-17
1986-10-28
Weakley, Harold W.
Valves and valve actuation
Fluid actuated or retarded
Fluid and non-fluid actuators
137 72, 137 75, 137 77, F16K 3100
Patent
active
046194347
ABSTRACT:
Disclosed is a heat sensitive jack for overriding a valve including a valve body and a gate valve member connected to a valve stem which is operated by a linear actuator having an actuator body and an actuator stem connected to the valve stem extending outwardly of the actuator body, wherein the actuator stem is movable between an open and a closed position, and wherein no hazardous projectiles are formed when the stem moves to the closed position. The jack includes a cap connectable to the body and a nut axially movably disposed in the cap for movement between a first position and a second position, wherein the distance between the first and second positions is at least as great as the distance between the open and closed positions of the valve. A fusible element is provided to normally maintain the nut in the first position, but which upon being exposed to excessive temperature will allow the nut to move to the second position within the cap. A jack screw is threadably engaged in an axially movable with respect to the nut and adapted to be moved into abuttment with the jack stem when the cap is connected to the actuator body to jack the stem toward the open position.
REFERENCES:
patent: 800740 (1905-10-01), Hoelder
patent: 2817349 (1957-12-01), Seaver
patent: 2997052 (1961-08-01), Mangini
patent: 3958592 (1976-05-01), Wells
patent: 4044785 (1977-08-01), Larsen
patent: 4240455 (1980-12-01), McGee
Bruton Billy R.
Snyder David E.
Axelson, Inc.
Weakley Harold W.
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