The invention discloses an all-welded
ball valve pair valve body die, and particularly relates to the technical field of die sets, the all-welded
ball valve pair valve body die comprises a lower die set, a positioning ring, a sleeve plate and a
peripheral precise limiting
welding mechanism; wherein the
peripheral precise limiting
welding mechanism comprises a limiting electric cylinder, a limiting frame, a limiting distance sensor, a
butt joint distance sensor, a sliding frame, a linkage screw rod, a driving motor, a linkage screw rod rotating part, two sleeving blocks, a limiting clamping plate and a hot melting heater; wherein a port accurate limiting
welding mechanism and an internal accurate limiting
assembly are further arranged. By means of the
peripheral precise limiting welding mechanism, precise limiting welding is conducted on the end opening position of the upper auxiliary valve body through the arc-shaped sleeve plate, the welding precision of the mold set on the
ball valve auxiliary valve body is greatly improved, and therefore the problems that in the welding and extruding process of the ball valve auxiliary valve body, excessive
extrusion is prone to occurring, or too shallow
extrusion is caused, and the welding precision of the ball valve auxiliary valve body is affected are solved. And therefore, the welding accuracy of the mold group on the valve body of the ball valve pair is reduced.