Working principle of expansion valve The expansion valve, also known as a throttle valve, is the main component of the automotive air conditioning and refrigeration system. It is installed at the entrance of the evaporator. As shown in Figure 15, it is the boundary between the high pressure and low pressure of the automotive air conditioning and refrigeration system. Its function is to throttle and depressurize the high-pressure liquid refrigerant from the storage dryer, adjust and control the amount of liquid refrigerant entering the evaporator, adapt it to changes in refrigeration load, and prevent the compressor from liquid shock ( That is, the unevaporated liquid refrigerant is compressed after entering the compressor, which is very easy to cause damage to the compressor valve plate) and the steam at the outlet of the evaporator is abnormally overheated. The temperature-sensitive expansion valve used in automobile air-conditioning and refrigeration systems, also called thermal expansion valve, uses the temperature-sensitive package installed at the outlet of the evaporator to sense the superheat of refrigerant vapor (superheat means that the actual temperature of the vapor is higher than that of evaporation Temperature value), to adjust the opening of the expansion valve to control the flow of liquid refrigerant into the evaporator. The temperature sensing bag is in contact with the outlet tube of the evaporator. When the temperature of the outlet of the evaporator decreases, the volume of the liquid in the temperature sensing bag, capillary tube, and film upper chamber shrinks, and the valve port of the expansion valve closes, thereby restricting the refrigerant from entering the evaporator. On the contrary. If the outlet temperature of the evaporator rises, the expansion valve will open. In order to increase the refrigerant flow. The bending and forming of the metal plate is carried out on the bending machine. Place the workpiece to be formed on the bending machine, lift the brake shoe with the lifting lever, slide the workpiece to the proper position, and then lower the brake shoe to the workpiece to be formed, and realize the bending of the metal by applying force to the bending lever of the bending machine. Sheet Metal,Forming Mount Unit,Laser Cutting Cover,Sheet Metal Forming Process Dongguan Formal Precision Metal Parts Co,. Ltd , https://www.formalmetal.com