filter is an indispensable device on the transmission medium pipeline, usually installed in the pressure relief valve, pressure relief valve, fixed water valve, square filter other equipment at the inlet end of the equipment. When the filter has a certain size of the filter cylinder, its impurities are blocked. When it needs to be cleaned, as long as the detachable filter cylinder is removed, it can be reloaded after processing. Therefore, it is convenient to use and maintain.