Maintenance of electric butterfly valve

If you do not carefully check the service conditions and performance specifications of the valve before installing the wafer electric butterfly valve, the wafer electric butterfly valve may have the following common faults:

The valve cannot be reversed or the reversing action is slow, gas leakage, failure of solenoid pilot valve, etc.

(1) The non reversing or slow reversing action of the wafer type electric butterfly valve is generally caused by poor lubrication, stuck or damaged spring, oil stain or impurity stuck sliding part, etc. In this regard, first check whether the oil atomizer works normally; Whether the viscosity of lubricating oil is appropriate. If necessary, replace the lubricating oil, clean the sliding part of the wafer electric butterfly valve, or replace the spring and wafer electric butterfly valve.

(2) After being used for a long time, the wafer type electric butterfly valve is prone to wear of the valve core sealing ring and damage of the valve stem and valve seat, resulting in gas leakage in the valve, slow action of the valve or failure of normal reversing and other faults. At this time, replace the sealing ring, valve stem and valve seat, or replace the wafer type electric butterfly valve.

(3) If the inlet and exhaust holes of the solenoid pilot valve are blocked by oil sludge and other sundries, the sealing is not tight, the movable iron core is stuck, the circuit is faulty, etc., all of which can lead to the failure of normal commutation of the wafer type electric butterfly valve. For the first three cases, clean the oil sludge and impurities on the pilot valve and movable iron core. Circuit faults are generally divided into control circuit faults and electromagnetic coil faults.

Before checking the circuit fault, turn the manual knob of the wafer electric butterfly valve for several times to see whether the wafer electric butterfly valve can reverse normally under the rated air pressure. If it can reverse normally, the circuit is faulty. During the inspection, the instrument can be used to measure the voltage of the solenoid coil to see whether it reaches the rated voltage. If the voltage is too low, further check the power supply in the control circuit and the associated travel switch circuit. If the wafer type electric butterfly valve cannot be reversed normally under the rated voltage, check whether the connector (plug) of the solenoid coil is loose or not. The method is to unplug the plug and measure the resistance of the coil. If the resistance is too large or too small, it means that the solenoid coil has been damaged and should be replaced. The purchased wafer type electric butterfly valve should be installed in time after unpacking. Generally, the valve manufacturer will debug the valve before leaving the factory. Do not loosen the accessories on the valve at will. If you must check, you need to contact the manufacturer first.