High-temperature and high-pressure metal sealing ball valve

The invention relates to a high-temperature and high-pressure metal sealing ball valve. The high-temperature and high-pressure metal sealing ball valve comprises a valve body, a valve base, a sphere and a valve rod. Mainly, the potions, on the two sides of a center line of a sphere through hole, of the sphere are each provided with a plane; the planes on the two sides of the sphere are each internally provided with a ball clack; the ball clacks are in movable fit connection with round concave holes in the sphere through round convex columns; annular spring cavities and springs in the cavities are manufactured between the ball clack planes on the radial outer sides of the round convex columns and the sphere planes; annular anti-blocking grooves are manufactured in the portions, on the outer sides of the annular spring cavities, of the sphere planes; medium dredging grooves which lead to the outer surface of the sphere and are communicated with the annular anti-blocking grooves are manufactured in the portions, close to the spring cavities in the outer round faces of the round convex column, of the sphere planes; the valve base is fixedly installed in a valve body channel through a positioning ring; and a concave spherical face, matched with the sphere and the spherical faces of the ball clacks, of a positioning ball clack is manufactured on the positioning ring valve cavity side. The ball clacks of the high-temperature and high-pressure metal sealing ball valve are reliable in floatation, good in temperature resistance and suitable for the high-temperature and high-abrasion working condition of particle media.