Subsurface tubing safety valve

Details Subsurface tubing safety valve Subsurface tubing safety valve

1992-05-01

1993-11-23

Rivell, John

Valves and valve actuation

Pivoted valves

Biased

251 634, 13751629, 166332, E21B 3410

Patent

active

052638472

ABSTRACT:
There is disclosed a subsurface tubing safety valve of the type having a flapper swingable between an open position to one side of its bore and a closed position over a seat about its bore. A seal ring retained in a groove about the seat has a protruding lip which is initially engaged by the flapper as it is swung toward the seating surface of the seat.

REFERENCES:
patent: 2162578 (1939-06-01), Hacker
patent: 4427071 (1984-01-01), Carmody
patent: 4433702 (1984-02-01), Baker
patent: 4457376 (1984-07-01), Carmody et al.
patent: 4583596 (1986-04-01), Davis
patent: 4674575 (1987-06-01), Guess
patent: 4716968 (1988-01-01), Pringle
patent: 4834183 (1989-05-01), Vinzant et al.
patent: 5125457 (1992-06-01), Meaders

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