Plug valve is a type of quick opening and closing straight through valve. Due to the wiping effect of the movement between the sealing surfaces, it can completely prevent contact with the flowing medium when fully opened. Therefore, it is usually used for media with suspended particles. Another important feature of it is that it is easy to adapt to multi-channel structures, so that a valve can obtain two, three, or even four different flow channels. This can simplify the design of pipeline systems, reduce the number of valves used, and minimize the need for some connecting accessories in equipment.