The filter is an indispensable device on the transmission medium pipeline. It is usually installed at the inlet end of pressure reducing valves, pressure relief valves, fixed water level valves, square filters and other equipment. After the filter has a filter cartridge with a certain size of filter mesh, the impurities are blocked. When cleaning is needed, just take out the detachable filter cartridge and reinstall it after processing. Therefore, it is extremely convenient to use and maintain.