Combination check valve & back pressure valve

Details Combination check valve & back pressure valve Combination check valve & back pressure valve

1992-09-28

1994-06-14

Bui, Thuy M.

Wells

Processes

Placing or shifting well part

166325, E21B 3400

Patent

active

053201817

ABSTRACT:
The invention relates to a combination valve and back pressure valve which in one embodiment performs as a two-way check valve, and in another embodiment performs as a back pressure valve. The invention contains both apparatus and method claims. The valve includes a cylindrical member having an inlet port and an outlet port, with a bore therethrough. A valve sleeve is disposed within the bore. A valve stem is also slidably disposed within the bore. A selective dis-attachment assembly is incorporated into the valve and includes pre-selected shear pistons.

REFERENCES:
patent: 2919709 (1960-09-01), Schwegman
patent: 3040710 (1962-06-01), Wilder
patent: 3051246 (1962-08-01), Clark, Jr. et al.
patent: 3954138 (1976-05-01), Miffre
patent: 4645006 (1987-02-01), Tinsley
patent: 4646844 (1987-03-01), Roche et al.

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