Causes and treatment methods of leakage of electric butterfly valve

Overview of Electric Butterfly Valve

An electric butterfly valve is a kind of valve commonly used in the fields of petrochemical, shipbuilding, power station, metallurgy, pharmaceutical, and light industry, mainly used to cut off or control the medium in the pipeline. Electric butterfly valves will inevitably encounter various faults during long-term use, and leakage is one of the more common faults. This article mainly introduces the causes of leakage of electric butterfly valves and the corresponding treatment methods.
Generally speaking, there are three main situations of leakage of the electric butterfly valve, namely leakage at the packing, leakage on the sealing surface, and leakage at the flange connection.

There are two main reasons for the leakage at the packing of the electric butterfly valve:

1. The user uses too much force during operation, so we must use normal force to turn the valve evenly during operation, and we must not use too much force.
2. When filling the packing, the compression sleeve bolts are not fully tightened, which leads to leakage, so we only need to tighten the packing bolts evenly.

For the leakage of the sealing surface of the electric butterfly valve, the causes and corresponding solutions are as follows.

1. The electric butterfly valve is not closed tightly, and there is a gap that causes the sealing surface to leak. If you encounter this problem, just readjust the bolts on the electric actuator.
2. Because the valve has not been used for a long time, some dirt has accumulated on the sealing surface, which cannot be completely closed and causes leakage. We only need to use high-speed fluid to flush the sealing surface.
3. There is damage on the sealing surface, resulting in uneven sealing. This requires us to re-grind the sealing surface and adjust the gasket compensation.

There are generally three reasons for leakage at the flange connection structure of the electric butterfly valve

1. The studs are not tightened or the tightening force is uneven, resulting in leakage. The solution is to re-tighten the bolts with uniform force.
2. The flange gasket has aged or been damaged due to long-term use. The solution is to replace the new flange gasket.
3. The selection of flange gaskets is not appropriate. For the selection of flange gaskets, it is necessary to select appropriate gasket materials according to the working conditions. If the selection is not appropriate, leakage will inevitably occur after a period of time.

The above are the causes of leakage of electric butterfly valves and the corresponding treatment methods. I hope it will be helpful to everyone.