TOP ENTRY PLASTIC BALL VALVE

摘要

A top entry plastic ball valve comprises a valve stem cap (1), a valve stem (2), a valve stem sealing ring (3), a valve ball sealing ring (5), a supporting ring (6) for the valve ball sealing ring, a valve ball (7), a connecting pipe (8), and a valve body (9). A hollow valve ball chamber (911) is provided inside the valve body (9), the valve body (9) is provided with a valve cover hole (912) just above the valve ball chamber (911), and a width of the valve cover hole (912) is larger than a diameter of the valve ball (7). The ball valve also comprises a valve cover (4), which is provided with a valve stem axial hole (410) for allowing the valve stem (2) to pass through and corresponds to the valve cover hole (912) so that the valve cover (4) can cover the valve cover hole (912) and can be fusion-bonded to the valve body (9), thereby avoiding the need of the electric fusion welding process in the manufacture of the large-caliber ball valve.