Three-way fittings made from seamless steel pipes are commonly produced using two processes: hydraulic expansion and hot pressing. The hydraulic expansion of stainless steel three-way fittings is a forming technique that involves axially compensating the metal material to bulge out the branch pipe. The process uses a hydraulic press to inject fluid into the billet with the same diameter as the three-way fitting, with the fluid being simultaneously extruded from both horizontal cylinders of the hydraulic press. After extrusion, the volume of the billet decreases, and the internal pressure of the fluid in the billet increases with the reduction in billet volume. When the pressure reaches the required pressure for the expansion of the branch pipe in the stainless steel three-way fitting, even when buried underground, it exhibits excellent corrosion resistance.

It is suitable for various environments and locations, and is continually being utilized and promoted. As such, it is compatible with diverse water qualities, eliminating the need for water quality control beyond disinfection and sterilization. Additionally, it is resistant to corrosion and has minimal leakage, ensuring the purity and sanitation of water while eliminating secondary pollution. It can withstand high water flow impacts up to 30 meters per second, guaranteeing water quality across different fields and industries. It can be used in various locations, playing a crucial role.

It boasts excellent mechanical and physical properties. The seamless elbow has a high strength, three times that of copper pipes and 8-10 times that of PP-R pipes. It can withstand vibrations and impacts well, and upon connection, it features no leakage, no bursting, fire resistance, and seismic resistance, making it highly reliable. Additionally, it has good thermal insulation properties, particularly suitable for hot water transmission, playing a crucial role in connections.