There are many reasons for the failure of the pneumatic control valve, so it is necessary to adopt corresponding methods to eliminate it in order to effectively extend the service life of the pneumatic valve.

Pneumatic valve has input signal but no action failure

1. Failure of the actuator

2. The valve stem is bent or broken

3. The valve core falls off

4. The valve core is stuck with the bush or the valve seat

5. The constant orifice of the amplifier in the positioner is blocked

Trouble shooting method of pneumatic regulating valve

1. Check the actuator and replace it immediately if damaged

2. Replace the stem

3. Reinstall the spool

4. Check the coaxiality of the valve shaft and reinstall

5. Use fine copper wire to remove debris from the constant orifice