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Introduce how to deal with the stuck or blocked valve

Release Date: March 19, 2018

Welding slag, rust, slag, etc. in the pipeline cause blockage or jam in the orifice, guide part, and lower bonnet balance hole, causing strain and scratches on the valve core surface, guide surface, and indentation on the sealing surface Wait.

1. Cleaning method

Welding slag, rust, slag, etc. in the pipeline cause blockage or jam in the orifice , guide part, and lower bonnet balance hole, causing strain and scratches on the valve core surface, guide surface, and indentation on the sealing surface Wait. This often happens early in the commissioning of new systems and overhauls. This is the most common failure. In this case, it must be disassembled for cleaning, and slag should be removed. If the sealing surface is damaged, it should be ground; at the same time, the bottom plug is opened to flush out the slag falling from the balance hole into the lower valve cover, and the pipeline Rinse. Before putting into operation, let the fluorine-lined regulating valve be fully opened, and the medium should flow into the normal operation after a period of time.

2.External scouring method

For some media that is easy to settle and contain solid particles, it is often blocked at the throttle port and the guide, and the flushing gas and steam can be connected to the bottom plug of the lower valve cover. When the valve is blocked or stuck, open the external gas or steam valve, and the flushing work can be completed without moving the fluorine-lined regulating valve to make the valve operate normally.

3.Install the pipeline filter method

For small-diameter fluorine-lined regulating valves, especially ultra-small-flow fluorine-lined regulating valves , the throttling gap is extremely small, and there must be no slag in the medium. In this case, it is best to install a filter on the pipe in front of the valve to ensure the smooth passage of the medium. A fluorine-lined regulating valve used with a positioner, the positioner does not work properly, and its throttle orifice is the most common failure. Therefore, when working with a positioner, the air source must be handled well. The usual method is to install an air filter pressure reducing valve on the air source line in front of the positioner.