Oil well safety valve for use with drill pipe

Details Oil well safety valve for use with drill pipe Oil well safety valve for use with drill pipe

1985-05-24

1987-03-17

Yeung, James C.

Valves and valve actuation

Fluid actuated or retarded

With mechanical movement between actuator and valve

175218, F16K 3116

Patent

active

046501533

ABSTRACT:
A safety valve and operator for a rotatable kelly or drill string. The valve includes a ball valve, a fluid operator, a swivel connection permitting rotation of the ball valve relative to the operator, and a mechanical movement for converting linear motion of the fluid operator to a pivoting motion for closing or opening the ball valve. A preferred form of the invention includes a rack-and-pinion device associated with the ball valve, a pair of bearing assemblies rotatably supporting the ball valve and rack-and-pinion assembly, and an annular hydraulic actuator connected to a housing which carries the bearing assemblies, the ball valve, and the rack-and-pinion assembly.

REFERENCES:
patent: 3806082 (1974-04-01), Kellner
patent: 3887161 (1975-06-01), Kubelka, Jr.
patent: 3941348 (1976-03-01), Mott
patent: 4422618 (1983-12-01), Lawson

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