actuator

actuator
A mechanical, electrical, or hydraulic device, or their combination, used to effect some predetermined linear, rotary, or oscillating movement. An actuator essentially converts hydraulic or air pressure into mechanical force. Basically, there are two types of actuators: single-acting and double-acting. In the single-acting actuator, the piston moves in a single direction as a result of system pressure. In a double-acting system, the actuator’s piston moves in either direction. The fluid enters from one side of the piston and is drained out of the other. The double-acting actuator may be balanced or unbalanced. In the former case, movement in both directions is equal, whereas in the latter case, the movement to one side is greater than the other.
A double-acting actuator.

Aviation dictionary. 2014.

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