Valves and valve actuation – Blow-out preventers
Patent
1982-06-25
1985-01-08
Chambers, A. Michael
Valves and valve actuation
Blow-out preventers
92110, 92117R, 92146, E21B 3306
Patent
active
044923597
ABSTRACT:
A ram-type valve assembly for well blowout prevention applications and the like. Opposing ram assemblies disposed in ram guideways transverse to the valve bore are each provided with two pistons extending outward of the valve housing having internal passages communicating with respective passages internal of the housing terminating in respective closing and opening ports. A cylinder assembly with interconnected cylindrical chambers is slidably disposed about respective pistons. Pressurizing the closing or opening ports transmits pressure through the pistons to the chambers, effecting cylinder assembly movement along the pistons inward toward and outward from the bore, respectively. Each cylinder assembly is interconnected to its respective ram, transmitting cylinder movement to the ram. The hydraulic circuits are isolated from the bore preventing hydraulic circuit contamination and accidental ram opening from bore pressure leaks into the hydraulics. Cylinder stroke is longer than that of the ram in normal opening and closing operation, such that removal of bonnet bolts permits further outward travel of the cylinders, moving the ram out of the ram guideway for servicing or changing.
REFERENCES:
patent: 3208357 (1965-09-01), Allen et al.
patent: 3272222 (1966-09-01), Allen
patent: 4178838 (1979-12-01), Stafford
patent: 4437643 (1984-03-01), Brakhage, Jr. et al.
Chambers A. Michael
Novack Sheri
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