Patent ID: 6969042

Claim:
A blowout preventer comprising 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, the booster piston including a booster shaft projecting therefrom, the booster shaft movable within the member opening, the booster shaft having a booster shaft space therein, the shaft including a push portion with part thereof within the booster shaft space, the push portion including an end portion movable with the booster piston to abut the piston end of the ram shaft to prevent movement of the ram shaft, the push portion positioned for transferring force of the booster piston to the primary piston upon abutment of the end portion with the piston end of the ram shaft, and fluid channel apparatus for directing power fluid to and from the primary piston and the booster piston.