Top-mounted type hard sealing ball valve

A top-mounted hard sealing ball valve comprises a valve body, a ball, a valve rod, a valve seat, an overlapped disc spring washer, a valve seat spring, valve seat O-shaped rings, a valve seat sealing ring, a vent valve and a fixing shaft. The valve body is of an integral top-mounted design, the vent valve is arranged on the valve body, the valve rod is of a bottom-mounted structure, and a boss is arranged on the lower portion of the valve rod; a sealing groove is formed in the front end of the valve seat, the valve seat sealing ring is embedded in the sealing groove of the valve seat, and the section of the valve seat sealing ring is triangular; two sealing grooves are formed in the middle portion of the valve seat, the valve seat O-shaped rings are embedded in the sealing grooves, and the number of the valve seat O-shaped rings is two; a convex head is arranged at the tail end of a metal valve seat, the disc spring washer is arranged on the convex head in a sleeved mode, the disc spring washer is the overlapped disc spring washer, one side of the valve seat spring is connected with the disc spring washer, the other side of the valve seat spring abuts against the valve body, and the disc spring washer can bear large load and reset pretension force of the valve seat spring. The top-mounted hard sealing ball valve is simple in structure, good in sealing performance, and convenient to dismount and repair online.