Valve override mechanism

Details Valve override mechanism Valve override mechanism

1988-06-18

1989-07-04

Rivell, John

Valves and valve actuation

Fluid actuated or retarded

Fluid and non-fluid actuators

251 636, F16K 31143

Patent

active

048444073

ABSTRACT:
An improved override structure for a valve having an override stem having T slot on its first end for connecting to the T shape of the valve member stem, an actuator threaded onto the override stem for moving the override stem axially to cause movement of the valve member between open and closed positions, pins and slots for preventing rotary movement of said actuator, an engaging member for receiving a handwheel on the other end of the override stem for imparting rotation to the override stem within the actuator, such rotation causing axial movement of the override and valve member stems to move the valve member without movement of the actuator.

REFERENCES:
patent: 2733041 (1956-01-01), Crookston
patent: 3402912 (1968-09-01), Watkins
patent: 3417960 (1968-12-01), Stehlin
patent: 3765642 (1973-10-01), Nelson
patent: 4230299 (1980-10-01), Pierce, Jr.
patent: 4436279 (1984-03-01), Bonds et al.
patent: 4650151 (1987-03-01), McIntyre

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