What is the primary function of an expansion valve in a refrigeration cycle?

The primary function of an expansion valve in a refrigeration cycle is to control the flow of refrigerant into the evaporator. This is a crucial task in maintaining the efficiency and effectiveness of the refrigeration process. By regulating the amount of refrigerant that enters the evaporator, the expansion valve ensures that it is appropriately metered, allowing the refrigerant to expand and absorb heat effectively from the surrounding environment. This process contributes to the cooling effect necessary for refrigeration systems to function properly.

Controlling the refrigerant flow is important for balancing the system's pressure and temperature, thus optimizing the overall efficiency of the refrigeration cycle. Without proper control, either too much or too little refrigerant may enter the evaporator, leading to issues such as inefficient cooling, increased energy consumption, or compressor strain.