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2022

Several classifications of temperature control valves

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1. Steam warm bulb
The medium filled in the temperature bulb is a low-boiling liquid. When the temperature rises, part of the liquid is vaporized into gas, and the volume of the temperature bulb increases to push the valve stem, close the valve opening, and reduce the flow of water into the radiator. When the outside temperature decreases, part of the gas liquefies into liquid again, the volume of the temperature bulb decreases, and the opening of the valve increases, thereby increasing the water inlet flow of the radiator. The temperature sensing medium in the temperature bulb is often in a mixed state of gas and liquid. Its advantage is that the action time is fast, but the sealing requirements for the temperature bulb are very strict, and it is rarely used in China at present.
2. Liquid temperature bulb
The temperature sensing medium filled in the temperature bulb is a special liquid, generally methanol or toluene. This kind of warm bulb has a large volume and a short action time, and is currently widely used in China.
3. Solid-state temperature bulb
The temperature bulb is filled with solids with high expansion coefficient, mostly paraffin. Since the volume of solid is relatively small when heated (cold) compared to gas and liquid, its temperature sensing action is slower, but its volume is smaller than that of liquid temperature bulb, and it is also partially used in China.
4. Metal sheet
The temperature sensing device of the temperature regulator is a special alloy metal sheet with memory function. The metal sheet expands and contracts due to heat, which drives the temperature control valve to move. This kind of product needs to be strictly tested and tested for its temperature sensing device before leaving the factory. At the same time, due to the change of characteristics such as fatigue fracture after frequent expansion and bending of metal, and the metal has ductility, it will be sensitive to this kind of temperature. Device life and accuracy are affected. Some domestic manufacturers produce such temperature control valve products, and their foreign products are rarely seen.