Valves and valve actuation – Blow-out preventers – Radial reciprocating ram
Reexamination Certificate
2005-11-29
2005-11-29
Jacyna, J. Casimer (Department: 3751)
Valves and valve actuation
Blow-out preventers
Radial reciprocating ram
C251S001100
Reexamination Certificate
active
06969042
ABSTRACT:
A blowout preventer with a main body; a base releasably connected to the main body, the base having a base space therein, the base having a ram shaft opening; a primary piston movably disposed within the base space; a ram shaft to which the primary piston is connected, the ram shaft including a ram end and a piston end; a ram connected to the ram end of the ram shaft; a housing connected to the base, the housing having a housing space therein, the housing including a middle member with a member opening; a booster piston movably disposed within the housing space and having a booster shaft projecting therefrom and a booster shaft space therein; the shaft including a push portion selectively movable to abut the ram shaft to prevent movement of the ram shaft and to transfer force of the booster piston to the primary piston; and power fluid apparatus for the primary piston and the booster piston.
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MPL Components. MPL Automatic Ram Locking. Hydril Mechanical Products Division. 2 pp. published Nov. 19, 1996 with U.S. Patent 5.575.452.
NXT BOP System. Shaffer. Varco. 6 pp. 2001.
Jacyna J. Casimer
McClung Guy
Varco I/P Inc.
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