What is the function of an expansion valve?

The function of an expansion valve is to reduce the pressure on liquid refrigerant as it enters the evaporator coil. When the refrigerant flows through the expansion valve, its pressure decreases, causing it to expand and thereby absorb heat from the surrounding environment. This process is crucial in refrigeration and air conditioning systems, as it allows the refrigerant to change from a liquid to a vapor, effectively cooling the air that is circulated through the system.

This reduction in pressure allows the refrigerant to evaporate at lower temperatures, which enhances the overall efficiency of the cooling cycle. The expansion valve thus plays a vital role in controlling the flow and pressure of refrigerant to ensure optimal performance of the system.