Modern electric actuators offer a wide range of technologies and features, from basic motor controls to sophisticated electronic controls. Many choices are available, since no single design or feature set meets the needs of every application.
Actuators are motorized gear drives that control the operation of multi-turn valves, slide gates and dampers; or quarter-turn valves and dampers. Some actuators, including those compared in this paper, use electricity as a power source. Other types of actuators, such as those powered by hydraulic fluid or pneumatic pressure, are not addressed in this paper. Applications vary, requiring the user to select some form of actuator control system. Typical control systems range from simple electro-mechanical controls found in intrusive actuator designs, to solid-state electronic controls found in non-intrusive designs.
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