Definition of tee

Tee belongs to pipe fittings and pipe connectors. Also called pipe fittings tee or tee fittings, tee joints, used in the main pipe to branch pipe.

A tee has three openings, namely an inlet and two outlets; A chemical pipe fitting with two inlets and one outlet, either T-shaped or Y-shaped, with equal or reduced orifices, used for the gathering of three identical or different pipes. The main function of the tee is to change the direction of the fluid.

Classification of tee

Divided by pipe diameter size

The end of the equal diameter tee is the same size;

The pipe size of the reduced tee is the same, while the pipe size of the branch is smaller than that of the main pipe.

Classification of tee by process

1. Hydraulic expansion

The hydraulic expansion of tee is a forming process which compensates the axial expansion of the branch pipe by the metal material. The process is to use a special hydraulic press to inject liquid into the tube billet with the same diameter as the three-way, and then squeeze the tube billet through the synchronous middle movement of the two horizontal side cylinders of the hydraulic press. The volume of the tube billet becomes smaller after extrusion, and the liquid in the tube billet increases with the volume of the tube billet. When the pressure required by the three-way branch pipe expands, Under the dual action of liquid pressure in the side cylinder and the billet, the metal material flows along the inner cavity of the mold and expands out the branch pipe.

Three-way hydraulic bulging process can be formed once, with high production efficiency; The thickness of the head and shoulder of the tee increased.

Due to the large tonnage of equipment required by the hydraulic expansion process of seamless tee, it is mainly used in the manufacturing of standard wall thickness tee less than DN400 in China. Its suitable forming materials are low carbon steel, low alloy steel, stainless steel with relatively low cold hardening tendency, including some nonferrous metal materials, such as copper, aluminum, titanium and so on.

2. Hot pressing forming

Three-way hot pressing is to flatten the tube billet larger than the diameter of the three-way to about the size of the diameter of the three-way, and open a hole in the part of the stretching branch pipe; The billet is heated, put into the forming die, and loaded into the punching die of drawing branch pipe; Under the action of pressure, the billet is radial compressed, and in the process of radial compression, the metal flows to the branch pipe and forms a branch pipe under the tension of the die. The whole process is formed by the radial compression of the billet and the stretching of the branch pipe. Different from the hydraulic expansion tee, the metal of the hot press tee branch pipe is compensated by the radial movement of the billet, so it is also called radial compensation process.

The tonnage of equipment required for material forming is reduced due to the use of heated and pressed tees. The hot press tee has a wide adaptability to materials, suitable for low carbon steel, alloy steel, stainless steel materials; Especially for tees with large diameter and thick wall, this forming process is usually adopted.

Classification of tee divided by material

Carbon steel, cast steel, alloy steel, stainless steel, copper, aluminum alloy, plastic, PVC, etc.

Divided by production method

Jacking, pressing, forging, casting, etc.

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