Electric valve in the use of the process often appear all kinds of problems, for the production work difficult. According to the following table summarizes the electric valve fault repair process, the user can check in order to facilitate accurate search problems, shorten the maintenance time:
        1. Electric valve manual operation effort
        Reason: the packing gland is too tight, the valve inside the accident
        Solve: Loosen the gland, remove the valve check
        2. The electric valve does not act, the power is on, the input signal does not light
        Cause: Input signal no or input signal +, - polarity reversed
        3. The motor does not stop after the limit
        Cause: The upper and lower cams are improperly adjusted, the limit switch is faulty or the wiring is defective
        Solution: Update the adjustment limit cam, replace the limit switch and connect the limit switch wiring correctly
        4. The electric valve does not start, the power light is on, the input signal light is on
        Cause: power does not match or voltage is low, the input signal is wrong, the ambient temperature is high or the frequency is high and the capacitor breakdown
        Solution: the input signal selection switch to correctly reduce the ambient temperature, reduce the use of frequency and sensitivity; change the capacitor to replace the wire or even the wire connected to the corresponding plug
        5. Motor shock, fever
        Cause: The input signal has AC interference, the sensitivity is too high or the potentiometer and wiring is bad
        Solution: Check the input signal to eliminate interference or adjust the sensitivity potentiometer to reduce the sensitivity check to make it normal
        6. The electric valve valve position is too large or too small
        Cause: Poor potentiometer installation, zero and stroke adjustment bad
        Solution: Check the potentiometer to install, adjust the zero and stroke potentiometer
        7. Motor heating, running on their own to stop
        Cause: the load is too large and overload protection thermal protection action; zero and stroke adjustment is bad; control valve has foreign matter; packing gland too tight
        Solution: Check the adjustment valve to remove the overload or reduce the ambient temperature, adjust the zero and stroke potentiometer