What typically happens to the refrigerant as it passes through the expansion valve?

As the refrigerant passes through the expansion valve, a crucial transformation occurs where it experiences a decrease in both temperature and pressure. This process is essential in refrigeration cycles.

When the refrigerant enters the expansion valve, it is typically in a high-pressure state. The valve allows the refrigerant to expand rapidly, which causes a drop in pressure. This reduction in pressure also leads to a significant decrease in temperature due to the principles of thermodynamics, as the refrigerant absorbs heat from its surroundings during this expansion.

The expansion valve thus serves as a critical component in preparing the refrigerant for the next stages of the refrigeration cycle, where it will be evaporated and absorb heat from the environment. This is fundamental for ensuring efficient cooling in refrigeration and air conditioning systems.