Variable ram seal for blowout preventers

Details Variable ram seal for blowout preventers Variable ram seal for blowout preventers

1986-10-24

1988-09-13

Chambers, A. Michael

Valves and valve actuation

Blow-out preventers

Radial reciprocating ram

251 11, 277 31, E21B 3306

Patent

active

047703873

ABSTRACT:
An improved blowout preventer of the ram type is provided with means allowing limited relative rotational movement of support elements in the seal along with radial inwardly directed movement of the ram assembly to conform to drill string size and accommodate for a tighter seal thereby enabling support of heavier drill string assemblies of smaller diameter pipe.

REFERENCES:
patent: 4332367 (1982-06-01), Nelson
patent: 4447038 (1984-05-01), Floyd
patent: 4518144 (1985-05-01), Vicic et al.

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