Through which of the components shown in the illustration is flash gas formation a normal occurrence? GS-RA-25 Illustration GS-RA-25: the U.S. Coast Guard has not released this illustration.

Correct Answer: Option D — thermostatic expansion valve

Flash gas formation occurs normally inside the thermostatic expansion valve as high-pressure liquid refrigerant experiences a sudden pressure drop, causing a fraction of the liquid to instantly vaporize and cool the remaining liquid to saturation temperature.