Tee is also called pipe fitting tee or tee fitting, tee joint, etc. It is mainly used to change the direction of the fluid and is used at the branch pipe of the main pipeline. It can be classified by pipe diameter. Generally, it is made of carbon steel, cast steel, alloy steel, stainless steel, copper, aluminum alloy, plastic, argon, PVC and other materials.
The tee has three openings, one inlet and two outlets; Or a chemical pipe fitting with two inlets and one outlet, which has T-shaped and Y-shaped, equal diameter pipe orifice and reducing pipe orifice, and is used for the convergence of three identical or different pipelines. The main function of tee is to change the direction of fluid.
Divided by process
1. Hydraulic bulging
The hydraulic bulging of tee is a kind of forming process that expands the branch pipe through the axial compensation of metal materials. The process is to use a special hydraulic press to inject liquid into the tube blank with the same diameter as the tee, and squeeze the tube blank through the synchronous centering movement of the two horizontal side cylinders of the hydraulic press. The volume of the tube blank becomes smaller after extrusion, and the liquid in the tube blank increases with the volume of the tube blank. When the pressure required for the expansion of the tee branch pipe is reached, the metal material flows along the inner cavity of the die under the dual action of the side cylinder and the liquid pressure in the tube blank to expand the branch pipe.
The hydraulic bulging process of TEE can be formed at one time, and the production efficiency is high; The wall thickness of the main pipe and shoulder of the tee has increased.
Due to the large tonnage of equipment required for the hydraulic bulging process of seamless tee, it is mainly used in the manufacture of tee with standard wall thickness less than dn400 in China. The applicable forming materials are low carbon steel, low alloy steel and stainless steel with relatively low cold work hardening tendency, including some non-ferrous metal materials, such as copper, aluminum, titanium, etc.
2. Hot pressing
Tee hot pressing is to flatten the pipe blank larger than the tee diameter to the size of the tee diameter, and open a hole at the part of the stretched branch pipe; After heating, the tube blank is put into the forming die, and the die for drawing the branch pipe is installed in the tube blank; Under the action of pressure, the tube blank is compressed radially. In the process of radial compression, the metal flows towards the branch pipe and forms a branch pipe under the tension of the die. The whole process is formed through the radial compression of the tube blank and the stretching process of the branch pipe. Different from the hydraulic bulging tee, the metal of the hot pressed tee branch is compensated by the radial movement of the tube blank, so it is also called radial compensation process.
As the tee is pressed after heating, the tonnage of equipment required for material forming is reduced. The hot pressed tee has wide adaptability to materials, and is suitable for materials of low carbon steel, alloy steel and stainless steel; This forming process is usually used for tees with large diameter and thick pipe wall.