The butterfly valve is simple in structure, small in size and light in weight, and only consists of a few parts. Moreover, it can be opened and closed quickly only by rotating 90 °, which is simple to operate. At the same time, the electric valve has good fluid control characteristics. When the butterfly valve is in the fully open position, the thickness of the butterfly plate is the only resistance when the medium flows through the valve body, so the pressure drop generated by the valve is very small, so it has good flow control characteristics. Butterfly valve has two sealing types: elastic seal and metal seal. For elastic sealing valve, the sealing ring can be embedded on the valve body or attached to the periphery of the butterfly plate???

9. Valve model arrangement: the valve model shall generally indicate the valve type, driving mode, connection form, structural characteristics, sealing surface material, valve body material, nominal pressure and other elements. The standardization of valve models facilitates the design, selection and sales of valves. Nowadays, there are more and more types and materials of valves, and the model preparation of valves is more and more complicated. Although China has a unified standard for valve model compilation, it is increasingly unable to meet the needs of the development of the valve industry. At present, valve manufacturers generally adopt the unified numbering method; Where the unified numbering method cannot be adopted, each manufacturer shall formulate the numbering method according to its own needs.