Valves and valve actuation – Lost motion between actuator and valve – Overload release
Patent
1977-08-22
1979-03-20
Wealsley, Harold W.
Valves and valve actuation
Lost motion between actuator and valve
Overload release
251159, 251167, 251199, F16K 3144
Patent
active
041450264
ABSTRACT:
A valve having a body with a valve seat and valve element and actuating means for moving the valve element toward and away from the valve seat with stop means in the body for stopping the movement of the valve element when the element is positioned against the valve seat. Fluid-actuated seal means are provided for sealing between the valve seat and the valve element and fluid-actuation means including a piston and cylinder which are in fluid communication with the seal means for actuation of the seal means. The fluid-actuation means are connected to the valve-actuating means whereby the seal means are pressurized and relieved by movement of the valve-actuating means. A lost motion connection is provided between the valve-actuating means and the valve element for allowing the fluid-actuation means to pressurize and release the seal means without movement of the valve element and spring means are provided between the valve-actuating means and the valve element for allowing setting and release of the seal means without movement of the valve element. The fluid-actuated seals and the fluid-actuation means may be positioned in either the valve element or in the seat. The fluid-actuation means may be a closed system or may be an open system.
REFERENCES:
patent: 2726842 (1955-12-01), Seamark
patent: 2825528 (1958-03-01), Truitt
patent: 3642248 (1972-02-01), Benware
patent: 3711062 (1973-01-01), Kirkwood
patent: 3743244 (1973-07-01), Dickenson
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