Manufacturing process for forging flanged ball valve seats uses blanks with friction welding faces of water inlet seat and ball valve seat welded together by friction welding with welding slag in centre hole cleared by ram

摘要

Four dies are produced to which four parts are swage-forged. The blanks of a water inlet seat (1), a ball valve seat (2), a limiting seat (3) and a water outlet seat (4) are produced with the four swages and at the same time the centre holes and the socket chamber (21) for the balls are produced. The front side of the necks (11, 22) form a friction welding face whereby the friction welding faces of the blanks are welded together by friction welding to produce a left and right main body with the welding slag adhering to the neck and inner wall of the centre hole. The welding slag on the inside wall of the centre hole is removed by a ram to produce a smooth inside wall and the slag at the neck is removed by surface finishing. An indentation is worked out in the socket of the ball valve seat corresponding in circumference to that of the ball and a left groove for a left water seal is formed in the front inside wall of the centre hole of the limiting seat.