Flapper type safety valve for subterranean wells

Details Flapper type safety valve for subterranean wells Flapper type safety valve for subterranean wells

1982-02-18

1984-01-24

Novosad, Stephen J.

Wells

Valves, closures or changeable restrictors

Longitudinally movable operator

166325, E21B 3410, E21B 3412

Patent

active

044270712

ABSTRACT:
The disclosure relates to an improved flapper type safety valve for use in subterranean wells wherein the flapper valve is actuated from a horizontal closed position to a vertical open position by contact from a downwardly moving actuating sleeve. The top surface of the valve is elevated so that the bottom edge of the actuating sleeve always contacts the flapper valve at a position maximally spaced from the axis of its pivot mounting, thereby assuring that the opening force applied to the flapper valve has a maximum moment arm in order to overcome any fluid pressure differential existing across the flapper valve.

REFERENCES:
patent: 2162578 (1939-06-01), Hacker
patent: 3021151 (1963-01-01), Sizer
patent: 3845818 (1974-11-01), Deaton

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