What is the function of the expansion valve in an A/C system?

The function of the expansion valve in an air conditioning system is to regulate the flow of refrigerant into the evaporator. This component plays a crucial role in controlling the amount of refrigerant that enters the evaporator coil, where the refrigerant absorbs heat from the indoor air. By adjusting the flow, the expansion valve ensures that the system maintains optimal performance and efficiency, preventing overfeeding or underfeeding of refrigerant.

The expansion valve also contributes to the refrigerant's pressure drop, which allows it to expand and cool as it enters the evaporator. This process is essential for effective heat exchange, enabling the refrigeration cycle to continue efficiently. Thus, its primary function is indeed to manage the flow of refrigerant, making it an integral part of the air conditioning system.