Introduction to Electric Valve Actuators
It is possible to replace pneumatically operated valves with motorized valves in many industrial control applications. Electric motors and electricity are used to operate a motorized valve. Through linkages (brackets and couplings) or directly mounted on the valve shaft, the spindle of the valve is connected to the motorized (electric) actuator. Globe, gate ball, and butterfly valves are the most commonly operated by electric actuators. Since electric actuators are easy to interface with control systems, they are widely used in control systems. The control signals are also electrical, so the same conduit or conduit paths can be used. Unlike fluid power (pneumatic), electricity is typically available and can be run over long distances. When working in hazardous locations, special construction and wiring options must be considered. Electrical actuators have the following main advantages: Electricity is usually readily available and can be easily routed to actuators over long dista...