Patent ID: 11926408
Assignee: MOOG INC.
Field: Pharmaceuticals (Chemistry)
Classification: CPC B  A  F | IPC B  F

Claim 11:
12. A method of operating an actuation system for displacing a movable member relative to a fixed member, the movable member having a failsafe position and being displaceable away from the failsafe position, the actuation system comprising an actuator connecting the movable member to the fixed member, a hydraulic system, and a hydraulic rotary motor powered by the hydraulic system and arranged to drive the actuator to displace the movable member relative to the fixed member, the method comprising:
A) providing a failsafe valve in hydraulic communication with the hydraulic system and the hydraulic rotary motor;
B) providing a mechanical connection between the failsafe valve and the movable member;
C) providing hydraulic communication between a first hydraulic control line of the hydraulic system and a first control port of the hydraulic rotary motor, between a second hydraulic control line of the hydraulic system and a second control port of the hydraulic rotary motor, and between a return line of the hydraulic system and a return port of the hydraulic rotary motor, when the hydraulic pressure in the hydraulic supply line is greater than or equal to a predetermined normal pressure; and
D) operating the failsafe valve by way of the mechanical connection to provide hydraulic communication between the first control port of the hydraulic rotary motor and the return line of the hydraulic system, or between the second control port of the hydraulic rotary motor and the return line of the hydraulic system, when the hydraulic pressure in the hydraulic supply line is less than or equal to the predetermined normal pressure and the movable member is away from the failsafe position.