Y-type filter is an indispensable device in medium pipeline. It is usually installed at the inlet of pressure relief valve, pressure relief valve, constant water level valve or other equipment to eliminate impurities in the medium to protect the normal use of valves and equipment. When the fluid enters the filter cartridge with a certain size filter screen, its impurities are blocked, and the clean filtrate is discharged from the outlet of the filter. When cleaning is needed, only the removable filter cartridge is taken out and re-loaded after treatment. Therefore, the use and maintenance of the filter is very convenient.