Actuator with free-floating piston for a blowout preventer and t

Details Actuator with free-floating piston for a blowout preventer and t Actuator with free-floating piston for a blowout preventer and t

1998-05-08

1999-12-28

Ryznic, John

Motors: expansible chamber type

With correlated control of motive fluid and locking means

92 28, F15B 1526

Patent

active

060066474

ABSTRACT:
A method and apparatus for operating a fluid actuated actuator between one and another alternate positions provides different forces for locking and unlocking the actuator. The actuator may use the same fluid pressure to operate a primary piston within a cylinder and to operate the locking mechanism. Actuator fluid is communicated to unlock the lock member and to move the piston back to its open or unactuated position. A sequencing valve determines the proper sequence of actuating the primary piston before the locking mechanism is driven in place, and clearing the locking mechanism prior to reciprocating the piston back to its unactuated position. Different forces for locking and unlocking the locking mechanism is provided by a free-floating piston mounted on a guide rod. The invention may also be applied to a BOP or the like where different opening and closing forces are desired.

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