The electric valve positioner is the main accessory of the control valve. It takes the stem displacement signal as the input feedback measurement signal, and uses the controller output signal as the setting signal for comparison. The output signal causes the actuator to act, and establishes a one-to-one correspondence between the valve stem displacement and the controller output signal. Next, the editor will introduce the role of electric valve positioner.

1. The electrical valve positioner is an adjustment system that requires high adjustment quality. It is necessary to improve the positioning accuracy and reliability of the adjustment valve.

2, the installation is where the pressure difference between the two ends of the valve is greater than 1MPa. Increase the output force of the starter by increasing the air pressure, overcome the abnormal force generated by the fluid on the spool, and reduce the error in the stroke.

3. In order to avoid external leakage, when the flowing fluid contains high temperature, high pressure, low temperature, toxic, flammable, explosive, etc., the filling is usually squeezed very tightly, and the friction between the valve stem and the filling is used Increase, and then use the positioner to overcome the time lag.

4. When the fluid is a viscous fluid or the fluid contains solid suspended matter, the use of a positioner can reduce the resistance of the fluid to the movement of the valve stem.

5. The positioner is also capable of overcoming the transmission lag of the control signal and improving the response speed of the valve.

6. ​​Improve the flow characteristics of the regulating valve.

7. When a single regulator controls two actuators, two positioners can be used, one moves at a low range and the other moves at a high level. Respectively accept low input signal and high input signal to reach the state of split-range adjustment.