Electric actuators are mainly matched with valves and used in automated control systems. There are many types of electric actuators with different operating modes. For example, a 1/4-turn electric actuator outputs angular torque, and a linear stroke electric actuator outputs displacement thrust. The type of electric actuator used in the system should be selected according to the working needs of the valve.

The types of valves are very diverse, and the use and operating principles of different valves are not the same, but in general, the valve controls the opening and closing or opening and closing by rotating the angle of the valve flap or lifting the valve plate. The choice of electric actuator depends on how the valve is opened and closed.

1. Rotary electric actuator

The rotary electric actuator is used in combination with the rotary valve. The output shaft of a 1/4-turn electric actuator rotates less than 1 revolution, that is, 360 degrees. For example, butterfly valves, ball valves, and plug valves usually rotate less than 90 degrees. The actuator can be rotated 90 degrees to realize the opening and closing process of the valve. Square stroke electric actuators can be divided into direct-connected electric actuators and base crank electric actuators according to the installation interface mode. The output shaft of the direct-coupled electric actuator is directly connected to the valve stem, and the base crank electric actuator is connected to the valve stem through the crank.

2. Multi-turn electric actuator

Multi-turn electric actuator is also an electric actuator that outputs angular torque. The difference with the 1/4-turn electric actuator is that the output shaft rotates more than 360 degrees. Multi-turn electric actuators are suitable for gate valves, glove valves and other rotary valves that can be opened and closed by multi-turns.

3. Straight stroke electric actuator

The linear electric actuator outputs displacement thrust. This applies to valve types used for disc lift control, such as single-seat control valves and double-seat control valves.