How does the expansion valve function in a refrigeration cycle?

The function of the expansion valve in a refrigeration cycle is to regulate the flow of refrigerant into the evaporator while also reducing its pressure. As the refrigerant passes through the expansion valve, its pressure drops significantly, which facilitates its transformation from a liquid state to a low-pressure vapor state. This reduction in pressure allows the refrigerant to absorb heat effectively within the evaporator by evaporating at lower temperatures.

By regulating the flow, the expansion valve ensures that the right amount of refrigerant enters the evaporator, which is crucial for maintaining optimal cooling efficiency and preventing issues such as flooding or starvation within the evaporator coil. Ultimately, this process is essential for the overall effectiveness of the refrigeration cycle, as it directly influences the heat absorption capability of the refrigerant.