Common Faults and Solutions for Wafer Butterfly Valves

Before installing the wafer electric butterfly valve, you must carefully check the valve usage and performance specifications. If you do not check, there may be the following common faults: the valve cannot change direction or the direction change action is slow, gas leakage, electromagnetic pilot valve has fault etc.

1. The problem of gas leakage caused by wafer butterfly valve and its solution

After a long period of use, the wafer type electric butterfly valve is prone to wear of the sealing ring of the valve core, damage to the valve stem and valve seat, resulting in gas leakage in the valve, slow valve movement or abnormal reversing and other faults.

At this time, the sealing ring, valve stem and valve seat of the wafer butterfly valve should be replaced, or the wafer butterfly valve should be replaced with a new one.

2. Wafer butterfly valve cannot change direction or change direction slowly

The wafer-type electric butterfly valve cannot change direction or the direction-changing action is slow, which is generally caused by poor lubrication of the wafer-type butterfly valve, stuck or damaged spring, oil or impurities stuck on the sliding part, etc.

In this regard, you should first check whether the lubricator of the wafer butterfly valve is working normally; whether the viscosity of the lubricating oil is appropriate. If necessary, replace the lubricating oil, clean the sliding part of the wafer butterfly valve, or replace the spring of the wafer butterfly valve and wafer type electric butterfly valve.

3. The solution to the failure of the solenoid pilot valve of the wafer butterfly valve

If the inlet and exhaust holes of the electromagnetic pilot valve of the wafer butterfly valve are blocked by sludge and other debris, the seal is not tight, the movable iron core is stuck, and the circuit is faulty, etc., the wafer butterfly valve can not be reversed normally.

For the first three cases, the oil sludge and impurities on the wafer butterfly valve pilot valve and movable iron core should be cleaned, and the wafer butterfly valve circuit failure is generally divided into two types: control circuit failure and electromagnetic coil failure.

Before checking the circuit fault, you should turn the manual knob of the wafer butterfly valve a few times to see if the wafer butterfly valve can change direction normally under the rated air pressure. If it can change direction normally, it is a wafer butterfly valve. There is a problem with the circuit.

During the inspection, the voltage of the electromagnetic coil of the wafer butterfly valve can be measured with a meter to see whether it has reached the rated voltage. If the voltage is too low, further checks should be made to control the power supply in the wafer butterfly valve circuit and the associated travel switch circuit.

If the wafer type electric butterfly valve cannot change direction normally under the rated voltage, check whether the joint (plug) of the wafer type butterfly valve electromagnetic coil is loose or not in good contact.

The detection 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 electromagnetic coil of the wafer butterfly valve is damaged, and the wafer butterfly valve should be replaced.