What is the function of the expansion valve in a refrigeration system?

The function of the expansion valve in a refrigeration system is to regulate the flow of refrigerant entering the evaporator and to reduce the pressure of the refrigerant. As the refrigerant passes through the expansion valve, it experiences a drop in pressure, which allows it to expand and evaporate in the evaporator coil. This phase change from liquid to vapor absorbs heat, effectively chilling the refrigerant further.

By controlling the amount of refrigerant that enters the evaporator, the expansion valve ensures that the evaporator operates efficiently, maintaining the desired temperature within the refrigeration system. This regulation is crucial for optimizing the system's performance and preventing issues such as flooding or starving the evaporator, both of which can lead to decreased efficiency and potential damage to components in the refrigeration system.