An expansion valve is a crucial component in refrigeration and air conditioning systems. Its primary function is to regulate the flow of refrigerant into the evaporator. By controlling the pressure and temperature of the refrigerant, the expansion valve ensures that the system operates efficiently, allowing for effective heat absorption. There are different types of expansion valves, including thermostatic expansion valves and electronic expansion valves. Each type has its own method of operation, but all aim to maintain optimal refrigerant flow. Proper functioning of the expansion valve is essential for the overall performance of the system, impacting energy efficiency and cooling capacity.