Three-way internal thread plug valves are mainly used in pipelines to cut, upgrade and change the direction of medium flow. It is easy to adapt to multi-channel construction, so that a valve can obtain two, three, or even four different flow channels, which can simplify the design of the piping system, reduce the amount of valve doors and some of the connection accessories required in the equipment. The purpose of the three-way internal thread plug valve is installed on the pipeline, mainly for cutting, distributing and changing the flow direction of the medium. The applicable medium is water, oil, steam, and no pulsating working pressure. The medium temperature ≤ 100 °C, and the nominal pressure is 0.6, 1.0, 1.6MPa