초록 ▼

A valve actuator for a subsea oil well installation includes a rotatable adjusting member (53) for engagement with the valve spindle, and a linear fluid actuator (17) coaxial with the adjusting member and operable by fluid pressure pulses to index the adjusting member around selectively in either di

A valve actuator for a subsea oil well installation includes a rotatable adjusting member (53) for engagement with the valve spindle, and a linear fluid actuator (17) coaxial with the adjusting member and operable by fluid pressure pulses to index the adjusting member around selectively in either direction. A mechanical movement converts linear motion of the actuator to rotary motion of the adjusting member. A fluid operated clutch selectively connects the fluid actuator to the adjusting member. A shaft (65) projects from the rear end of the actuator casing to permit manual adjustment as well. Position sensors (120) emit signals indicative of the valve position, and a pointer (123) at the rear of the casing provides a visual indication of the valve condition.

대표청구항 ▼

A valve actuator comprising a support frame, a rotatable valve adjusting member carried by the frame for engagement with a valve spindle, fluid actuating means mounted on the frame substantially coaxially with said valve adjusting member, the fluid actuating means defining two chambers and including

A valve actuator comprising a support frame, a rotatable valve adjusting member carried by the frame for engagement with a valve spindle, fluid actuating means mounted on the frame substantially coaxially with said valve adjusting member, the fluid actuating means defining two chambers and including a reciprocable output member having a normal position, said chambers having means for supplying fluid pressure signals thereto for actuating said output member to reciprocate in opposite directions from said normal position, a rotatable driving member, means for converting linear movement into rotational movement coupled between said output member and said driving member, rotation transmitting means to connect kinematically the driving member to the valve adjusting member for rotation of the driving member to rotate the valve adjusting member, fluid pressure operable means for engaging said rotation transmitting means for the driving member to rotate the valve actuating member during a working stroke of the output member away from said normal position and for disengaging said rotation transmitting means for the driving member to rotate independently of the valve adjusting member during a return stroke of the output member towards said normal position, whereby fluid pressure signals supplied to said fluid operable means and to the respective chambers of the fluid actuating means cause the valve adjusting member to be indexed around selectively in opposite directions of rotation of said member for adjusting the spindle of a valve to which the actuator is connected.