The working principle of electric butterfly valve

by:AIRWOLF     2020-05-19
Electric butterfly valve is composed of electric actuators and butterfly valves, so it has the butterfly valve is easy to operate, the advantages of simple structure. Electric butterfly valve principle: by means of electric device to drive the stem, make the butterfly plate produces 90 ° rotation movement and reach the valve opening and closing. The principle of electric actuator is very simple, just like daily use razors, energy source is electricity, electricity has been driving the operation of the valve plate, so as to achieve open/close the valve and the role of circulation or by the fluid. The electric butterfly valve electric actuator type can be divided into the switch and the external regulation, switch type electric butterfly valve is to play the role of switch; And external regulation electric butterfly valve is to have the effect of flow adjustment, can accurate flow control to micrometer degrees, is also a valve of price is quite high. Valve as a device installed in the pipeline, if going to the field to check the status of the switch does not seem very realistic, so there is the existence of feedback signals. External regulation itself with the feedback signal, and the switch type according to the customer's specific needs to choose whether to install feedback signal. 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. Read on: & gt; Electric valve does not work after the power supply solution & gt; Manual and electric valves which is better & gt; Pneumatic valve failure analysis and solution & gt; How to correctly choose electric valve device
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