Electric butterfly valve is the main control butterfly valve in the production process automation system. It is an important implementation unit of field instrument. If the electric butterfly valve in the operation of the fault, maintenance personnel must be able to quickly analyze the cause of the fault judgment. And correct troubleshooting, to ensure that the production is not affected.

The following is the summary of six kinds of electric butterfly valve common faults and causes of analysis, troubleshooting methods. For your reference in the maintenance work.

One of the fault phenomena: the motor does not start.

Analysis of possible causes: 1. Power line disconnection; 2. Control line failure; 3. Stroke or torque control mechanism failure.
Corresponding troubleshooting methods: 1. Check the power line; 2. Troubleshoot the line; 3. Troubleshoot the travel or torque control mechanism.

Fault phenomenon two: the rotation direction of the output shaft does not meet the requirements.

Possible cause analysis: the phase sequence of power supply is reversed.
Corresponding elimination method: exchange any two power lines.

Fault phenomenon three: motor overheating.

Analysis of possible causes: 1. Too long continuous working time; 2. Disconnection of one phase line.
Corresponding elimination methods: 1. Stop the operation to cool the motor; 2. Check the power cord.

Fault phenomenon 4: the motor stops running.

Possible cause analysis: 1. Butterfly valve is in fault; 2. Electric device is overloaded and torque control mechanism acts.
Corresponding elimination methods: 1. Check the butterfly valve; 2. Increase the setting torque.

Fault phenomenon 5: the motor does not stop or the light does not light up after the switch is in place.

Possible cause analysis: 1. The travel or torque control mechanism is faulty; 2. The travel control mechanism is improperly adjusted.
Corresponding elimination methods: 1. Check the travel or torque control mechanism; 2. Readjust the travel control mechanism.

Fault phenomenon 6: there is no valve position signal in the distance.

Possible causes: 1. The set screw of potentiometer gear is loose; 2. The remote potentiometer is faulty.
Corresponding Troubleshooting: 1. Tighten the set screw of potentiometer gear; 2. Check and replace the potentiometer.