The expansion valve is a very important refrigeration accessory in industrial chillers. It mainly serves to throttle, reduce pressure and regulate flow. At the same time, it also has the functions of preventing wet compression and liquid hammer protection for the compressor and abnormal overheating. It is mainly composed of three major parts: the valve body, the temperature sensing bulb and the balance tube.
The expansion valve is generally installed between the liquid storage cylinder and the evaporator in an industrial chiller. The expansion valve throttles the medium-temperature and high-pressure liquid refrigerant into low-temperature and low-pressure wet vapor. Then, the refrigerant absorbs heat in the evaporator to achieve the cooling effect. The expansion valve controls the valve flow by the change in superheat at the end of the evaporator to prevent insufficient utilization of the evaporator area and knocking of the cylinder.
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