Tee is also called pipe tee or tee pipe fitting, tee joint and so on. It is mainly used to change the direction of the fluid, and is used at the main pipe branch. It can be classified according to the pipe diameter. Generally made of carbon steel, cast steel, alloy steel, stainless steel, copper, aluminum alloy, plastic, argon, pvc and other materials. Commonly used as pipe fittings and pipe connectors. Also called pipe tee or tee pipe fittings, tee joints are used where the main pipeline is to be branched. Tee is a kind of chemical pipe fittings with three ports, namely one inlet and two outlets; or two inlets and one outlet, with T-shaped and Y-shaped, with equal-diameter orifices, and also with different-diameter orifices. Where three identical or different pipelines meet. The main function of the tee is to change the direction of the fluid.
According to the diameter of the pipe
The ends of the equal diameter tees have the same size;
The main pipe takeover size of the tee with different diameter is the same, while the size of the branch pipe is smaller than that of the main pipe.
By process
Hydraulic bulging
Three-way hydraulic bulging is a forming process that bulges out of the branch pipe through the axial compensation of the metal material. The process is to use a special hydraulic machine to inject liquid into the tube blank equal to the diameter of the tee, and squeeze the tube blank through the centering movement of the two horizontal side cylinders of the hydraulic machine. After the tube blank is extruded, the volume becomes smaller and the tube blank As the volume of the tube blank becomes smaller, the pressure rises. When the pressure required to swell the tee branch tube is reached, the metal material flows along the cavity of the mold under the double action of the liquid pressure in the side cylinder and the tube blank to expand the branch tube.
The hydraulic bulging process of the tee can be formed at one time, and the production efficiency is high; the wall thickness of the tee's main pipe and shoulder are increased.
Because of the large tonnage of the equipment required for the hydraulic bulging process of the seamless tee, it is mainly used in the manufacture of standard wall thickness tees 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 and titanium.
2. Hot press forming
Three-way hot press forming is to crush the tube blank larger than the diameter of the three-way tube to the size of the three-way diameter, and make a hole in the stretched branch pipe; the tube blank is heated and placed in the forming die and placed in the tube blank The die of the drawn branch pipe is inserted into it; under the action of pressure, the tube blank is compressed radially. During the process of radial compression, the metal flows toward the branch pipe and forms the branch pipe under the stretching of the die. The whole process is formed by the radial compression of the tube blank and the stretching process of the branch pipe. Different from the hydraulic bulge tee, the metal of the hot-pressed tee branch pipe is compensated by the radial movement of the tube blank, so it is also called the radial compensation process.
The tonnage of the equipment required for material forming is reduced due to the pressing of the tee after heating. Hot-pressed tees have a wide adaptability to materials, and are suitable for low-carbon steel, alloy steel, and stainless steel materials; especially tees with large diameters and thick pipe walls, this forming process is usually used.
By material
Carbon steel, cast steel, alloy steel, stainless steel, copper, aluminum alloy, plastic, argon, pvc, etc.
According to the production method
Jacking, pressing, forging, casting, etc.
By manufacturing standards
National standard, electric standard, chemical standard, water standard, American standard, German standard, Japanese standard, Russian standard, etc., as follows: GB/T12459-2017, ASME B16.9, SH3408, SH3409-96, SH3410-96, HG/ T21635, DL/T 695, SY/T 0510, DIN 2615.