Drill string safety valve

Details Drill string safety valve Drill string safety valve

1981-05-20

1983-07-05

Pate, III, William F.

Wells

Valves, closures or changeable restrictors

Fluid operated

166321, 175318, E21B 3408

Patent

active

043913288

ABSTRACT:
A multi position safety valve retainable within an internal portion of a drill string casing (s) and responsive to the greater differential pressure in an internal fluid passage to displace a valve head (32) relative to a valve seat (VS) from its normal partially open position to either a wide open or a closed position. The valve head (32) is attached to a valve stem (30) that extends through a valve chamber and slideably mounted in opposite closed ends of a valve body and returnable to and maintained in the partially open position by opposing compression springs (34) (36) situated between opposite ends (22) of the valve body (VB) and one side of an intermediate abutment (30c) of the valve stem (30) and an intervening disc (38) on the opposite side thereof. The disc 38 is moveable into and out of seating engagement with an intermediate stop (20a) by one spring (34) and the intermediate abutment (30c) of the valve stem respectively.

REFERENCES:
patent: 2578818 (1951-12-01), Martin
patent: 3116752 (1964-01-01), Duncan
patent: 3122162 (1964-02-01), Sands
patent: 3385370 (1968-05-01), Knox et al.
patent: 3719401 (1973-03-01), Peruglia
patent: 3845784 (1974-09-01), Sullivan
patent: 3861414 (1975-01-01), Peterson
patent: 3902523 (1975-09-01), Gaut
patent: 3990420 (1976-11-01), Bittermann et al.
patent: 4270569 (1981-06-01), Reay et al.

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