Butterfly valve is a structurally simple control valve that can be used for on/off control of low-pressure pipeline media. Valves can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal, and radioactive media. They mainly serve to cut off and restrict flow in pipelines. The butterfly valve opening and closing component is a disc-shaped butterfly plate that rotates around its own axis inside the valve body to achieve the purpose of opening, closing, or adjusting.