Pneumatic actuator selection precautions
Pneumatic actuator is a pneumatic pressure to drive open and close or adjust the valve actuator! Also known as pneumatic actuator or pneumatic device, but generally known as pneumatic head, pneumatic actuator sometimes equipped with a certain auxiliary device! Valve positioner and handwheel mechanism commonly used valve positioner function is to use the feedback principle to improve the performance of the actuator, so that the actuator can be accurate positioning according to the controller's control letter!
In the actual production process, the correct choice of pneumatic valve pneumatic actuator is very important, because if the actuator is too large, the valve if the actuator is too small, can not produce enough torque to fully operate the valve.
In general, the selection of pneumatic actuators needs to consider a variety of factors, such as valve service conditions, service temperature, operating frequency, management and pressure difference, delivery medium (lubrication, drying, mud), etc. When choosing pneumatic actuators, the main points are as follows:
1. Operation thrust. Valve electrical device has two main engine structure, one is a direct output torque without the configuration of thrust disc; The other is to convert output torque to output thrust through the stem nut in the thrust disk.
2. Operation torque. Choose the main parameters of the valve electric device, the output torque of the pneumatic actuator should be 1.2 ~ 1.5 times of the larger torque of the valve operation.
3, the diameter of the stem to the multi rotary type of rod valve. An electric valve cannot be ASSEMBLED IF THE LARGER stem diameter ALLOWED BY THE electric device does not pass through the stem of the supplied valve. Therefore, the inner diameter of the hollow output shaft of the electrical device must be larger than the outer diameter of the valve stem. For part of the rotary valve and multi-rotary valve in the dark stem valve, although do not need to consider the diameter of the valve stem through, but in the selection should also fully consider the diameter of the valve stem and the size of the keyway, so that after assembly can work normally.
Pneumatic actuator is a pneumatic pressure to drive open and close or adjust the valve actuator! Also known as pneumatic actuator or pneumatic device, but generally known as pneumatic head, pneumatic actuator sometimes equipped with a certain auxiliary device! Valve positioner and handwheel mechanism commonly used valve positioner function is to use the feedback principle to improve the performance of the actuator, so that the actuator can be accurate positioning according to the controller's control letter!
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