Engine Refrigeration (Supplementary) USCG Question #413 (Set 6)

Which of the following electrically operated refrigeration system valves would be most appropriate for use as a 2 position diverting hot gas bypass solenoid valve? GS-RA-19 Illustration GS-RA-19: the U.S. Coast Guard has not released this illustration.

Official USCG Answer & Rule Citation

Correct Answer: Option A — B

Valve "B" is designed for reliable two-position operation, making it suitable for hot gas defrost or bypass duties where positive shutoff and rapid flow redirection are required within marine HVAC and refrigeration circuits.

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