A linear actuator is an actuator that creates linear motion (i.e., in a straight line), in contrast to the circular motion of a conventional electric motor.

Device that converts energy, rotates.

Device that moves read/write heads.

A valve actuator is the mechanism for opening and closing a valve.

A pneumatic control valve actuator converts energy (typically in the form of compressed air) into mechanical motion.

Electro-hydraulic actuators (EHAs), replace hydraulic systems with self-contained actuators operated solely by electrical power.

An idle air control actuator or idle air control valve (IAC actuator/valve) is a device commonly used in fuel-injected vehicles to control the engine's idling rotational speed.

A rigid chain actuator, known variously as a linear chain actuator, push-pull chain actuator, electric chain actuator or column-forming chain actuator, is a specialized mechanical linear actuator used in window operating, push-pull material handling and lift applications.

Plasma actuators are a type of actuator currently being developed for active aerodynamic flow control.