Three pass, also known as pipe three or three pipe fittings, three pass joint, used in the main pipe to branch pipe. Three with equal diameter and diameter of nozzle, the end diameter three links are the same size; different diameter three pass charge the same size, and the size is smaller than the head of branch pipe pipe size.

We can use galvanized seamless pipe to make galvanized three pass, the process method has hydraulic bulging and hot pressing forming two kinds. The hydraulic bulging of the three way is a forming process that expands the branch pipe through the axial compensation of the metal material. The hydraulic bulging process of the three way can be formed at one time, and the production efficiency is higher. The head of three pass and the thickness of the shoulder wall are all increased. Three pass hot forming tube blank will be greater than three in diameter, about three to flatten the size of the diameter, open a hole in the pipe tensile part; billet heated in forming model, and the tube is arranged in the pipe drawing die; under the pressure of the tube by radial compression in the process, the radial compression in the direction of flow and the formation of metal pipe to pipe in the drawing die.

Galvanized three - way pipe is widely used in industry, construction, decoration and other industries.