three-way ball valve is divided into T-type and L-type according to the structure. three-way ball valve is mainly used to cut off, distribute and change the flow direction of the medium in the pipeline. It has good heat preservation and cold preservation characteristics, and the diameter of the valve is the same as the pipe diameter. At the same time, it can effectively reduce the heat loss of the medium in the pipeline, which is convenient for disassembly, maintenance and cleaning of the valve cavity.