Blowout preventer ram lock

Details Blowout preventer ram lock Blowout preventer ram lock

1979-09-24

1981-09-22

Schwadron, Martin P.

Valves and valve actuation

Blow-out preventers

92 17, 92 24, E21B 3306, F15B 1526

Patent

active

042905770

ABSTRACT:
A ram lock for blowout preventer rams which permits locking of the ram at multiple and adjustable positions. Automatic locking of the ram at a desired position, such as in adjustable sealing positions to compensate for ram elastomer wear, is obtained. The ram also automatically unlocks in response to opening fluid pressure acting on a cylinder liner which contains a ram carrier moving the ram.

REFERENCES:
patent: Re27294 (1972-02-01), Fredd
patent: 2019163 (1935-10-01), Slater
patent: 2251269 (1941-08-01), Curtis
patent: 3208357 (1965-09-01), Allen et al.
patent: 3242826 (1966-03-01), Smith
patent: 4052995 (1977-10-01), Ellison
patent: 4076208 (1978-02-01), Olson

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