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

The purpose of the expansion valve in a refrigeration system is to reduce the refrigerant's pressure as it enters the evaporator. This reduction in pressure allows the refrigerant to expand and absorb heat from its surroundings or the area being cooled. As the high-pressure liquid refrigerant passes through the expansion valve, its pressure drops, which causes a subsequent drop in temperature. This process is essential because it enables the refrigerant to effectively vaporize and absorb heat, making it an integral part of the refrigeration cycle.

Understanding the role of the expansion valve is crucial for maintaining efficient system operation. The expansion valve controls the flow of refrigerant into the evaporator, ensuring that only the necessary amount enters to optimize the heat absorption process. This control helps maintain the overall efficiency and effectiveness of the refrigeration system.