The forming of the three-way pipe fitting is to flatten the tube blank larger than the diameter of the three-way pipe fitting to the size of the diameter of the three-way tube, and open a hole in the stretched branch pipe; the tube blank is heated, placed in the forming mold, and placed in the forming mold. The tube blank is loaded with a punching die for stretching the branch tube; the tube blank is radially compressed under the action of pressure, and the metal flows in the direction of the branch tube during the radial compression process and forms a branch tube under the stretching of the punching die. The whole process is formed by the radial compression of the tube blank and the stretching process of the branch tube. Different from the hydraulic bulging tee fitting, the metal of the branch pipe of the tee fitting joint is compensated by the radial movement of the tube blank, so it is also called the radial compensation process. Features of three-way pipe fittings thermostat and precautions when purchasing:

　　1. The temperature sensing element of the three-way pipe fitting thermostat is inside the valve body, so there is no need for an external temperature sensor.

　　2. The three inlets and outlets of the three-way pipe fittings thermostatic valve can be connected to the pipeline with a variety of installation styles.

　　3. The three-way pipe fitting thermostat is small in size and light in weight. The thermostat is equipped with an emergency manual control device.

　　4. The three-way pipe fitting thermostat does not need an external energy source, and it is extremely convenient to use and maintain.

　　5. The temperature adjustment accuracy is high and stable.

　　Because the alloy tee fittings are heated and pressed to press the tee fittings, the tonnage of equipment required for material forming is reduced. Hot-pressed tee fittings have a wide range of material adaptability, and are suitable for low-carbon steel, alloy steel, and stainless steel; especially for tee fittings with large diameters and thicker walls, this forming process is usually used.

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