Engine Refrigeration (Supplementary) USCG Question #458 (Set 7)

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.

Official USCG Answer & Rule Citation

Correct Answer: Option B — thermostatic expansion valve

Flash gas is a normal thermodynamic occurrence inside the thermostatic expansion valve orifice, where a fraction of the high-pressure liquid instantly vaporizes to cool the remaining liquid down to saturation temperature.

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