What is the primary purpose of an expansion valve in HVAC systems?

The primary purpose of an expansion valve in HVAC systems is to regulate refrigerant flow and lower its pressure. The expansion valve plays a crucial role in the refrigeration cycle by controlling the amount of refrigerant released into the evaporator. As the refrigerant passes through the expansion valve, its pressure drops significantly, which allows it to expand and absorb heat from the surroundings in the evaporator. This process is essential for cooling, as it converts the refrigerant into a low-pressure vapor that can then absorb heat effectively.

In addition to regulating the flow of refrigerant, the expansion valve helps maintain the optimal temperature and pressure conditions within the system. This ensures that the system operates efficiently, maximizing comfort while minimizing energy consumption. The proper functioning of the expansion valve is vital for the overall performance and reliability of the HVAC system.