Bi-directional sealing ram

Details Bi-directional sealing ram Bi-directional sealing ram

1999-01-07

2000-12-26

Bagnell, David

Valves and valve actuation

Blow-out preventers

Radial reciprocating ram

277325, 166 854, 137112, E21B 3306

Patent

active

061646199

ABSTRACT:
A shuttle valve assembly in a ram-type BOP selectively connects the volume behind the rams to the more highly pressurized wellbore volume adjacent to the rams (either above or below the rams). The connection made is free flowing in both directions (no check valves) allowing for evacuation and fluctuations with changes in wellbore pressure.

REFERENCES:
patent: 4655431 (1987-04-01), Helfer et al.
patent: 4943031 (1990-07-01), Van Winkle
patent: 5074518 (1991-12-01), Berry
patent: 5890698 (1999-04-01), Domytrak

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