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Valve Positioner No Output Pressure Fault
Release time:
2026-04-07 15:22
As many people know, a valve positioner can significantly enhance the accuracy and reliability of control valve positioning. However, if the valve positioner malfunctions—such as when there is no output pressure—the impact on the normal operation of the valve can be very serious. Next, the valve positioner manufacturer will explain the common causes of no output pressure, so that in the future, when this issue arises, you can promptly identify the root cause and take appropriate corrective measures.
1. A malfunction of the valve positioner itself, or extensive air leakage in the signal piping, can result in the absence of signal pressure, thereby causing the positioner to produce no output pressure.
2. Lack of supply air pressure or insufficient supply air pressure results in no output pressure from the valve positioner.
3. If the bellows experience large-scale air leakage, this issue can be resolved by soldering repairs or replacement.
4. The orifice in the bellows is blocked; this issue can be resolved by using a thin metal wire to clear the blockage.
5. The zero-point adjustment of the valve positioner itself is improper—for example, if the gap between the baffle and the nozzle is too large. In such cases, simply readjust the pneumatic valve positioner.
6. If there are burrs or pits on the end face of the nozzle orifice, the burrs can usually be removed by regrinding, but pits generally require replacing the nozzle.
7. Air leakage at the bond between the nozzle and the base.
That concludes the content this article aims to share with you. We hope it will be of some help!
2020-01-19
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