What are the specific classifications of electric actuators?

What are the specific classifications of electric actuators?

(1) Electric multi-rotary

　　Electric driven multi-turn actuator is one of the commonly used and reliable actuator types. Use a one-way or three-way motor to drive the gear or worm gear and then drive the valve stem nut. The valve stem nut makes the valve stem move to open or close the valve.

　 Multi-turn electric actuator can quickly drive large-size valves. In order to protect the valve from damage, the limit switch installed at the end of the valve stroke of the stainless steel solenoid valve will cut off the power of the motor. At the same time, when the safety torque is exceeded, the torque sensing device will also cut off the power of the motor. The position switch is used to indicate the valve. Switch state, the handwheel mechanism with the clutch device can manually operate the valve when the power fails.

    The main advantage of this type of electric actuator is that all components are installed in a housing. The colored quartz tube level gauge integrates all basic and advanced functions in this waterproof, dust-proof, and explosion-proof housing. The main disadvantage is that when the power fails, the valve can only be kept in place. Only when the backup power system is used can the valve achieve a fail-safe position (fail-open or fail-close)

(2) Electric single rotary

　　 This type of actuator is similar to an electric multi-turn actuator, the main difference is that the final output of the actuator is a 1/4 revolution of 90 degrees of movement. The new generation of electric single-turn actuators combines most of the complex functions of multi-turn actuators, such as the use of a non-entry user-friendly operation interface to achieve parameter setting and diagnostic functions.

　　Single-turn actuators are compact and can be installed on small-sized valves, usually with an output torque of up to 800Nm. In addition, the required power supply should be small. They can be installed with batteries to achieve fail-safe operation.

(3) Fluid-driven multi-rotary or linear output

　　This type of actuator is often used to operate straight-through valves (stop valves) and gate valves, which use pneumatic or hydraulic operation. The structure is simple, the work is reliable, and it is easy to realize the fail-safe operation mode.

　　 Under normal circumstances, people use electric multi-turn actuators to drive gate valves and shut-off valves, and only consider using hydraulic or pneumatic actuators when there is no power supply.

(4) Fluid-driven single rotary

　　Pneumatic and hydraulic single-turn actuators are very versatile, they do not require power supply and are simple in structure and reliable in performance. They have a wide range of applications. Usually the output ranges from a few kilograms of meters to tens of thousands of kilograms of meters. They use cylinders and transmission devices to convert linear motion into right-angle output. Electric actuator transmission devices usually include: fork, rack and pinion, and lever. The rack and pinion output the same torque in the full stroke range. They are very suitable for small size valves. The shift fork has higher efficiency and high torque output at the beginning of the stroke is very suitable for large diameter valves. Pneumatic actuators generally install solenoid valves, positioners or position switches and other accessories to achieve valve control and monitoring.　

　This type of actuator is easy to achieve fail-safe operation mode

This article is original by the manufacturer of the magnetic turning column level gauge, please indicate http://www.sungofluid.com/