A valve actuator is the mechanism for opening and closing a valve. Manually operated valves require someone in attendance to adjust them using a direct or geared mechanism attached to the valve stem. An actuator is a type of motor that is responsible for moving or controlling a mechanism or system. It is operated by a source of energy, typically electric current, hydraulic fluid pressure, or pneumatic pressure, and converts that energy into motion. Given the importance of the actuator it is crucial to have top of the line actuator in order to keep your pool running smoothly. Shop actuators and actuator parts at PoolMart Center and save money on repairs.