Butt welded connection DC type T-filter is a device for removing solid impurities during the pipeline transportation of liquid. As liquid flows through the filter, impurities are filtered out, protecting pumps, compressors, instrumentation and other equipment. When it is necessary to clean, just take out the removable filter cartridge, remove the impurities filtered out, and re-install it, which is extremely convenient to use and maintain. Weakly corrosive materials in chemical, petroleum production and urban heating.