The valve the valve time after using the spool seal wear, valve stem and valve seat damage, which resulted in the valve leakage of gas, the valve of the slow-motion or does not work properly for the failure. At this point, you should replace the seal, valve stem and valve seat, or the valve replacement.
If solenoid pilot valve and vent the oil, such as mud blocked with debris, and cannot be closed ball valve, and active core is stuck, the circuit is defective, and so on, can cause the valve to switch. In the former case 3 should be the pilot valve and active core of oil mud and debris. The circuit fault in general, failure of the control circuit and solenoid failure. The circuit is defective, you should switch to the valve of the manual knob, look at the valve over the rated pressure is normal to switch to, if it can be normal to the circuit is defective. Check butterfly valves, available instrumentation solenoid voltage to see if it is up to the rated voltage, and if the voltage is too low, should be further check the control circuit in the power supply and the associated travel switch circuit.
If the rated voltage, the valve is not working properly for the, you should check enamel wire solenoid connector (plug) for loose or contact is not real-time. method is to disconnect the plug, measure the Coil Resistance value, if a value is too large or too small, the electric gate coil has been damaged and should be replaced.
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