Many people know that valve positioners can significantly improve the accuracy and reliability of regulating valve positioning. However, if the valve positioner fails, such as no output pressure, the normal operation of the valve will be seriously affected. Next, the valve positioner manufacturer will tell you the reasons why the positioner has no output pressure, so that you can know the reasons and take corresponding measures in time when you encounter this problem in the future.

1. There is a problem with the valve positioner itself or there is a large-scale air leakage in the signal pipeline, resulting in no signal pressure, so that the positioner has no output pressure.

2. There is no air supply pressure or the air supply pressure is low, resulting in no output pressure of the valve positioner.

3. There is a large-scale air leakage in the bellows. This problem can be solved by soldering or replacing it.

4. The throttle hole of the bellows is blocked. This problem can be cleared by using a thinner wire.

5. The 0-point position of the valve positioner itself is improperly adjusted, such as the gap between the baffle and the nozzle is too large. In this case, the pneumatic valve positioner can be readjusted.

6. There are burrs or pits on the end face of the nozzle hole. Burrs only need to be re-grinded, and pits basically require the nozzle to be replaced.

7. There is air leakage at the bonding point between the nozzle and the base.