Expansion valve

An expansion valve is a device in an HVAC system that controls the flow of refrigerant into the evaporator coil. It reduces the refrigerant’s pressure and temperature, allowing it to expand and change into a cooler, lower-pressure state. This process ensures the evaporator coil can absorb heat efficiently from indoor air. Expansion valves can be regulated by temperature, pressure, or a combination of both, and they play a key role in maintaining the desired cooling performance of the system.