In order to succeed the implementation of the process automation, the most important thing is to ensure that the valve can meet the special requirements of process medium and the pipe. Production process and process usually medium can decide the types of valves, valve core type and trims and structure and material of the valve. After selection of valve and then consider the requirement of the automation is the choice of the actuator. Can simply press the two basic types of valve operation to consider actuators. 1. Rotary valve ( Single rotary valve) This type of valve including: plug valves, ball valves, butterfly valves and air door or flap. This type of valve need has asked the actuator torque rotate 90 degrees operation. 2. Multi-turn valves are this kind of valve can be rotating lift stem or rotate the lift bar, or they need more turn operation to drive the valve to open or close position. This type of valve including: pass Industrial Valves ( Globe valve) , gate valve, knife gate valve and so on. As a kind of choice, output linear pneumatic or hydraulic cylinder or thin film actuator also drive the Industrial Valves. At present there are four types of actuators, they can use different driving energy, able to operate various types of valves. 1. Electric rotary actuators electric drive more more rotary actuator is the most commonly used, one of the most reliable type of actuator. Using single phase or three phase motor drive gear or worm gear and worm finally driven stem nut, stem nut to stem produce movement to make the valve opened or closed. Many rotary electric actuators can be fast driving large size valves. In order to protect the valve from damage, installed at the end of the valve stroke limit switch will cut off the motor power supply, when the safety moment is over at the same time, the torque sensor will also cut off the motor power, position switch is used to indicate the status of valve, installed the clutch device can be manual operation during power failure the valve handwheel institutions. Main advantage of this type of actuator is all parts are installed in a casing, in the waterproof, dustproof, explosion-proof enclosure integrated with all the basic and advanced function. Main drawback is that when the power failure, the valve can only stay in situ, only use standby power system, the valve can realize fail-safe position ( Fault on or off) 。 2. Electric single rotary actuators this actuator is similar to electric rotary actuators, the main difference is the final output of the actuator is 1/4 turn 90 degrees of motion. A new generation of electric single rotary actuator is a combination of most complex function of rotary actuator, such as: the use of entering type user friendly operation interface to realize the parameter setting and the diagnosis function. Single rotary actuator compact structure can be installed to the small size valve, usually the output torque of up to 800 kg of rice, the other should be required to power is small, they can install the battery to achieve a fail-safe operation. 3. Fluid drive rotary or linear output more actuators this type often used for direct operation actuator valve ( Globe valve) And the gate, they use pneumatic or hydraulic operating mode. Simple structure, reliable operation, easy to realize fail-safe operation mode. Usually people use electric rotary actuators to drive more gate and globe valves, only in the absence of power supply are considering to use hydraulic or pneumatic actuators. 4. Fluid drive single rotary actuator pneumatic, hydraulic rotary actuator is very general, they do not need power and simple structure, reliable in performance. Their application has a very wide range of areas. Often the output from a few kilograms meters to tens of thousands of kilograms of m. They use a cylinder and transmission device converts linear motion orthogonal output, transmission device usually has: fork, gear and rack, lever. Pinion and rack in the whole travel within the scope of the same output torque, they are very suitable for small size valve, fork has high efficiency in journey starting point with high torque output is very suitable for large diameter of the valve. General installation solenoid valve pneumatic actuators, locator, or accessories such as position switch to realize the control and monitoring of the valve. This type of actuator is easy to implement a fail-safe operation mode.
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