What is the function of the expansion valve in a refrigeration system?

The function of the expansion valve in a refrigeration system is primarily to regulate the flow of refrigerant into the evaporator. This component plays a crucial role in controlling the refrigerant's pressure and temperature as it enters the evaporator. By doing so, it ensures that the refrigerant expands properly and absorbs the maximum amount of heat from the surrounding environment. This is essential for efficient cooling, as it allows the refrigerant to change from a high-pressure liquid to a low-pressure vapor without overheating or flooding the evaporator.

The expansion valve thus acts as a critical control point in the refrigeration cycle, enabling the system to maintain optimal efficiency. When the valve opens, it permits a specific amount of refrigerant to flow into the evaporator, where it absorbs heat and cools the air or liquid surrounding it. This regulation process is vital for maintaining the desired temperature and pressure in the evaporator and overall system functionality.