Usually, when the electric control valve is stuck and blocked, we can choose the following two ways to solve the problem.
The welding slag, rust and residue in the pipe are blocked or stuck in the orifice plate of the lower cover, the guide position and the balance hole, resulting in scratches on the surface of the valve core and the guide surface, and indentation on the sealing surface. This is usually followed by major maintenance of new systems. This is the most common failure. In this case, the slag must be removed and cleaned. If the sealing surface is damaged, it should also be polished; at the same time, open the bottom plug to wash away the slag falling from the balance hole into the lower cover and flush the pipeline. Before putting into operation, the control valve should be fully opened to make the medium flow for a period of time before putting into normal operation.
2) external scouring method
For some media which are easy to precipitate and contain solid particles, the electric control valve can be used to externally erode the gas and steam at the bottom under the valve cover at the throttle hole and guide plug. When the valve is blocked or stuck, open the external gas or steam valve to complete the cleaning work without moving the control valve, so that the valve can operate normally.