Auto Car Thermal Expansion Valves

The auto ac expansion valve of the automotive air conditioner is installed at the entrance of the evaporator, and has two main functions.

Throttle effect. After the high temperature and high pressure liquid refrigerant is throttled through the orifice of the auto ac expansion valve, it becomes a low temperature and low pressure mist refrigerant, which creates conditions for the evaporation of the refrigerant.

Control the flow of refrigerant. The liquid refrigerant entering the evaporator, after passing through the evaporator, the refrigerant evaporates from liquid to gaseous state, absorbs heat, and reduces the temperature inside the car. The car ac expansion valve controls the flow of refrigerant to ensure that the outlet of the evaporator is completely gaseous refrigerant. If the flow rate is too large, the outlet contains liquid refrigerant, which may enter the compressor and cause liquid shock. If the flow rate is too small, the evaporation will be completed in advance, resulting in insufficient cooling.