What is the purpose of an expansion valve in an HVAC system?

The purpose of an expansion valve in an HVAC system is to reduce refrigerant pressure and control its flow. This valve is crucial in the refrigeration cycle, primarily between the condenser and the evaporator. When refrigerant flows through the expansion valve, it experiences a drop in pressure, which leads to a decrease in temperature. This chilled refrigerant can then efficiently absorb heat from the indoor air when it enters the evaporator coil, helping to maintain the desired indoor climate.

Additionally, the expansion valve regulates the amount of refrigerant that enters the evaporator, ensuring that it matches the cooling demand of the system. By controlling this flow, the valve plays a vital role in optimizing the system’s efficiency and performance, aiding in both energy conservation and effective heat exchange.