Safety valve

Details Safety valve Safety valve

1974-05-07

1976-03-02

Klinksiek, Henry T.

Valves and valve actuation

Fluid actuated or retarded

With mechanical movement between actuator and valve

166224A, F16K 31143, E21B 3300, F16L 500

Patent

active

039413489

ABSTRACT:
A remotely operable safety valve mounted between the swivel and the kelly in drilling operation including a spherically-shaped valve element which is mounted in a generally tubular housing rotatable with the swivel sub, the kelly and the drill string. Hydraulic means move the valve element between open and closed positions in order to control flow through the drill-string and prevent in-line blow outs. As an additional safety feature, spring means move the valve element to a closed position in the event of a failure of the hydraulic means.

REFERENCES:
patent: 3035808 (1962-05-01), Knox
patent: 3064937 (1962-11-01), Pryor
patent: 3167300 (1965-01-01), Kaiser
patent: 3473554 (1969-10-01), King
patent: 3750749 (1973-08-01), Giroux
patent: 3762471 (1973-10-01), Mott
patent: 3806082 (1974-04-01), Kellner

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