At present, the double eccentric hemispherical valve has been applied to pulverized coal injection in the steel industry, slurry, mother liquor and aluminum oxide powder transportation in the alumina industry, hydraulic (or dry) ash removal in the power industry, petrochemical industry, gas industry and other occasions. The double eccentric hemispherical valve is used to solve the problem of sediment in the transportation of "gas-solid" or "liquid-solid" two-phase mixed flow media A new type of valve developed for the technical problems of scaling and crystallization precipitation medium. In order to meet the requirements of the middle series double eccentric hemispherical valve seat assembly, a vertical hemispherical valve seat assembly machine was designed. During the assembly process, two transmission chains are switched so that it can rapidly screw in with small torque at the initial stage of assembly. In the middle of assembly, screw in at high torque and low speed.
At the end of assembly, impact tightening is carried out by using the stored energy release of flywheel. Under the control of industrial computer, the whole assembly process automation is realized. The development of hemispherical valve seat assembly machine has solved the technical problems of difficult control of preload and unstable assembly quality, and greatly improved the manufacturing level and production efficiency of eccentric hemispherical valve. The valve uses the close cooperation between the valve seat and the valve core to achieve hard sealing. The valve seat and valve body are fixed by spinning the screw sleeve, which requires a large axial preload.
