Durable ball valve

The utility model discloses a durable ball valve which comprises a valve seat, a ball valve core and a valve rod, an installation part is arranged in the middle of the valve seat, the ball valve core is located in the installation part, a sealing cover is arranged on the installation part, elastic sealing pieces are arranged on the two sides, corresponding to the ball valve core, of the valve seat, each elastic sealing piece comprises a movable sleeve, a spring and a fixing plate, and a sinking groove is formed in the end of the valve seat. The movable sleeve is of a T-shaped sleeve structure, one end of the movable sleeve extends to the position of the sinking groove, the fixed plate is installed in the sinking groove in a sliding mode, and the fixed plate is fixedly connected with the movable sleeve through a bolt. And the adjusting piece can rotate the movable sleeve, so that the abrasion position of the movable sleeve and the ball valve element can be changed, the abrasion degree of the local position of