Hemispherical valve

The invention relates to a hemispherical valve. The hemispherical valve comprises a valve body, a valve seat, a valve rod and a ball body, wherein the ball body adopts a hemispherical valve clack mechanism, and an eccentric structure is adopted between the rotary center of the hemispherical valve clack and the center line of the valve body channel; the hemispherical valve is mainly characterized in that a plurality of crushing teeth are arranged at the edge of the opening direction of the hemispherical valve clack, a plurality of guide plates are arranged on the inner wall of the valve cavityon one side of the opening direction of the hemispherical valve clack, and the end part cutters of the crushing teeth are inserted into flow guide grooves between the adjacent guide plates. When the valve is opened, a curing medium which is closest to the position of the valve seat is cut off under the action of the torsion of the valve rod, and a curing medium between the adjacent guide plates issheared and extruded, the