The design of micro-elastic adaptive groove with the same principle as wedge gate valve and the micro-compensation of the adaptive groove can appropriately reduce the assembly requirements of the valve and improve the qualincation rate of the primary assembly.Both ends ofthe sealing surface are designed to keep sharp edges. During the opening and closing process of the valve, the spherical adhesion dirt can be scraped to reduce the corrosion of the sphere and the damage of the sealing surface of the valve seat, Through continuous technological progress, the roughness of the sealing surface of the metal seat is less than 0.2, while the gas medium can attain zero leakage.