The wafer type concentric butterfly valve adopts the concentric design, and its main structure is composed of the valve body, valve flap, valve seat, valve stem and transmission operating mechanism. The valve seat adopts a detachable structure, so according to the physical and chemical characteristics of different media, it is suitable for the corresponding high temperature resistant, low temperature resistant, corrosion resistant, light resistant, and aging resistant materials. The concentric wafer type butterfly valve can be widely used as a regulating and intercepting device on fluid pipes such as water supply and drainage, sewage treatment, construction, air conditioning, petroleum, chemical, food, medical industry, textile, papermaking, hydropower, shipbuilding, metallurgy, energy system, etc. .