Safety valve

Details Safety valve Safety valve

1989-04-06

1989-08-29

Cohan, Alan

Valves and valve actuation

Fluid actuated or retarded

Piston type expansible chamber reciprocating valve actuator

166319, 251348, E21B 4312

Patent

active

048609919

ABSTRACT:
A safety valve where weight and length and consequently the cost is reduced to a minimum. A longitudinally moveable flow tube controls the movement of a valve closure element, a biasing mechanism biases the tube to a closed position, and a piston and cylinder assembly engages and moves the flow tube. A portion of the assembly is positioned beside and longitudinally overlaps the biasing mechanism for allowing the length of the valve to be reduced.

REFERENCES:
patent: 3092135 (1963-06-01), Brown
patent: 3799258 (1974-03-01), Tausch
patent: 4161219 (1979-07-01), Pringle
patent: 4716968 (1988-01-01), Pringle

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