Filters are small devices used to eliminate solid particles in liquids. They can be used to protect the normal functioning of compressors, pumps, meters, and other equipments. As liquids enter a piping filter with a certain filter size, the impurities are blocked, while the clean liquid leaves through the pipe outlet. When cleaning is needed, rotate open the plug screw at the bottom of pipe and discharge all liquids, and then remove the flange and take out the filtering cartridge for cleaning. Maintenance is therefore very easy. Nowadays, piping filters are widely used in fields such as petroleum, chemical industry, medicine, food industry, and environmental protection. If a piping filter is connected in series to the entrance of pumps or other parts of system pipelines, it can not only extend the lifetime of pumps and other devices, but also ensuring the safety of the whole system.