Common faults of pneumatic control valve and electric control valve
Time：
Dec 08,2022
Author：
Source：
| Common faults | cause | Methods of prevention and elimination |
| Motor of electric regulating valve does not start | No input power | turn on electricity |
| Broken wire or poor wire contact | Change the wire or connect the wire correctly | |
| Inconsistent power supply voltage or low voltage | Check the voltage with an instrument | |
| Thermal protection action (high ambient temperature or high frequency of use) | Reduce the ambient temperature, reduce the use frequency or sensitivity | |
| The power capacitor is broken down | Replace input signal selection | |
| Input signal error | ||
| Self stop during automatic operation | Overload protection due to excessive load | Check the regulating valve to remove the overload |
| Thermal protection action | Same as the previous item | |
| Foreign matters caught in the regulating valve | Even manual operation is very laborious. Remove the valve | |
| Over tightening of packing gland | Try loosening the gland | |
| Manual operation is laborious | Over tightening of packing gland | Try loosening the gland |
| An accident occurred inside the valve | Disassemble the valve for inspection | |
| The opening signal is not fully closed | The potentiometer is poorly installed. | Check the installation of the potentiometer |
| The motor does not stop with the limit switch | Poor adjustment of upper and lower limit given cam | Readjust |
| Poor contact of stopper | Replace the limit switch | |
| Reduced control sensitivity and reduced motor torque | Insufficient motor voltage | Low or inconsistent power supply voltage |
| Low or inconsistent power supply voltage | ||
| oscillation | Sensitivity is too high | Adjust the sensitivity potentiometer to reduce the sensitivity |
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