Valves

Details Valves Valves

1983-12-27

1985-04-02

Schwadron, Martin P.

Valves and valve actuation

Blow-out preventers

E21B 3306

Patent

active

045083134

ABSTRACT:
There is disclosed a blowout preventer having rams with cutting edges for shearing a pipe within which carry means for gripping opposite sides of the pipe above the cutting edges of the rams, as the rams move toward one another to shear the pipe, and lifting the upper sheared end of the gripped pipe out of the path of means for sealing between the inner ends of the rams, as the rams continue to move toward one another.

REFERENCES:
patent: 3946806 (1976-03-01), Meynier
patent: 4132266 (1979-01-01), Randall
patent: 4253638 (1981-03-01), Troxell, Jr.
patent: 4392633 (1983-07-01), Van Winkle

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