Is the spigot and socket connection of the ductile iron tube reversed?
The tube is heated, in forming model, and the tube is arranged in the pipe drawing die; under the pressure of the tube is radially compressed, in radial compression in the direction of flow and the formation of metal pipe to pipe in the drawing die.
The whole process is formed by the radial compression of the pipe blank and the stretching process of the branch pipe. Different from the hydraulic bulging three, the metal of the three way joint pipe is compensated by the radial movement of the tube blank, so it is also called radial compensation process.
The three pass joint is formed by flattening a tube blank larger than three through diameter to approximately three through the diameter and opening a hole at the point of the branch pipe;
