Why is it important for only liquid refrigerant to enter the expansion valve?

It is crucial for only liquid refrigerant to enter the expansion valve because this component is designed to regulate the flow of refrigerant into the evaporator coil. When only liquid refrigerant enters the valve, it ensures that the refrigerant can expand and evaporate effectively as it absorbs heat from the surrounding air, which is vital for the cooling process. If vapor refrigerant enters the expansion valve instead, it can lead to several issues.

One of the significant risks of having vapor refrigerant enter the expansion valve is the potential for compressor damage. The compressor relies on a consistent flow of liquid refrigerant to operate efficiently. If vapor enters the compressor, it can lead to inadequate lubrication and overheating, which may cause serious mechanical failure. Therefore, maintaining a liquid state before the refrigerant reaches the expansion valve is essential for protecting the integrity and longevity of the entire refrigeration system.