What is an Actuator?
An actuator is an operator mechanism that automates the opening/closing process of a valve. It is mounted on top of the valve and connected to the valve body. There are different types of actuators, each with different applications. Power-driven actuators are basically divided into three types:
Electric Actuator
Uses an electric motor to open and close the valve.
Pneumatic Actuator
Uses pressurized air-operated pneumatic systems to open and close the valve.
Hydraulic Actuator
Uses pressurized fluid-operated hydraulic systems to open and close the valve.
All three types have the common feature of enabling valves to operate faster than manual operation. They are commonly used, especially in large valves. All actuators are powered by electrical energy. In addition to opening and closing the valve, actuators also allow for intermediate positions. Limit switch boxes, I/P converters, and positioners mounted on these actuators can track the open/closed position of the valve and transmit position information to the automation system.