Pneumatic valve positioner means that it needs to receive the signal sent by the regulator, and after the signal is amplified, the pneumatic actuator is controlled, and then the negative feedback of the displacement of the valve stem is also accepted. Therefore, the positioner and the actuator form a closed-loop circuit, which greatly improves the performance of the actuator. The specifics of the position and characteristics of the pneumatic valve positioner and the method of debugging the positioner of the pneumatic valve are discussed below. 
Pneumatic valve positioner function and characteristics
1, pneumatic valve positioner in our lives, there are many places that need to be used, then for the effect of pneumatic valve positioner, many people may not know deep. Pneumatic intelligent control valve is added with a positioner and a two-position five-way electromagnetic valve for pneumatic actuators. When it is necessary to regulate the flow of the medium, the flow rate can be measured in weak signals such as 4-20mA on the positioner. Adjustment. Due to the regulating valve, the valve stem is in the middle stage, which will have an effect on the flow resistance. The valve stem is in a state of high pressure and corrosive fluid medium when the valve stem is soaked for a long time. Stainless steel or better materials should be selected to avoid distorting or corroding valve stems. Pneumatic valves cannot be effectively controlled when the air pressure is insufficient. For example, manual attachments should be added to more demanding engineering or hazardous systems. 
2, then a larger diameter pilot-type relay, she has the characteristics of eliminating air blockage, and can also make the action of the regulating valve becomes very fast, change the mode of action do not replace parts, just change the installation of the relay position. Replacing the cam can change the flow characteristics of the regulator valve, with linear, equal percentage and quick opening characteristics, which are sensitive and reliable. Even if the working conditions often change, the performance of the regulating valve is still stable, a bypass assembly is provided, and the positioning valve can be maintained without stopping the regulating valve.
Method for debugging pneumatic valve positioner
1, then the pneumatic valve positioner in the trip adjustment method, it is the first input of 20mA signal, then the stroke adjustment into a type of nut, increase the stroke to the right, that is to 20MA, the valve is not fully open, increase the right to increase the journey . When the leftward stroke is reduced to 18MA, the valve is fully closed, and the stroke is reduced to the left. Attention should be paid to whether the valve is fully opened to see whether the cam reaches a 90-degree scale. When the standard requirement is adjusted to 20MA, the cam corresponds to 90-scale, and the valve is full. Open, zero and stroke affect each other, and it can be repeated several times. 
2, then in the debugging of pneumatic valve positioner this project, it can be said that many people have not yet mastered the correct way, first we need to perform zero-bit debugging, and then in the input 4mA signal, zero adjustment knob. To the right to make the zero rise, to the left to make the zero drop standard requirements to be adjusted to, the cam pressure in the 0 scale, the pressure gauge pointer in about 5 kg, then zero.
3, pneumatic valve positioner is the most important pneumatic accessories in a pneumatic control valve, to receive the control of the signal sent, and then accurately position the role of the valve stroke position. Pneumatic valve positioner function, pneumatic valve positioner and pneumatic actuator together constitute the automatic control unit, and a variety of regulating valve connection after commissioning and installation. Combined into a pneumatic control valve, pneumatic valve positioner for a variety of industrial automation process control. 
Related content above pneumatic valve positioners on the role and characteristics, and a method of debugging pneumatic positioner on the introduction here, I hope these help you. If you still don't understand where you can pay attention to more news, if you want to learn more about this news, please continue to pay attention to our website.
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