On the wafer butterfly valve common faults and solutions

Before installing the sandwich electric butterfly valve, we must carefully check the use of the valve and the performance specification. If there is no check, there may be the following common failures:

Valve can not reverse or reverse action is slow, gas leakage, solenoid pilot valve failure.

(1) The wafering electric butterfly valve is easy to wear the valve core seal ring, valve stem and valve seat damage after a long time of use, leading to gas leakage in the valve, slow valve action or normal reversal and other failures. At this time, the sealing ring, stem and seat should be replaced, or the clip-type electric butterfly valve replaced.

(2) The clip-type electric butterfly valve can not reverse or reverse action is slow, generally due to poor lubrication, spring is stuck or damaged, oil or impurities stuck sliding part and other reasons. To this end, should first check the oil mist work is normal; Whether the viscosity of the lubricating oil is appropriate. If necessary, the lubricating oil should be replaced, the sliding part of the wafering electric butterfly valve should be cleaned, or the spring and the wafering electric butterfly valve should be replaced.

(3) If the inlet and outlet of the solenoid pilot valve are blocked by mud and other debris, the closure is not strict, the movable iron core is stuck, the circuit is faulty, etc., can lead to the wafering electric butterfly valve can not normally reverse. The first 3 cases should be cleaned pilot valve and movable core on the mud and impurities. The circuit fault is generally divided into control circuit fault and electromagnetic coil fault two categories.

Before checking the circuit fault, the manual knob of the clipped electric butterfly valve should be turned several times to see whether the clipped electric butterfly valve can reverse normally under the rated pressure. If it can reverse normally, it is a circuit fault. Check, available instrumentation to measure the voltage of the electromagnetic coil, see whether it has reached the rated voltage, if the voltage is too low, should further check the control circuit in the power supply and associated travel switch circuit.

If the wafer electric butterfly valve can not be reversed normally under rated voltage, it should check whether the electromagnetic coil joint (plug) is loose or contact is not real. The method is to unplug and measure the resistance value of the coil. If the resistance value is too large or too small, it indicates that the electromagnetic coil is damaged and should be replaced.