In a refrigeration system, the valve shown in the illustration is used for what purpose? GS-RA-14 Illustration GS-RA-14: the U.S. Coast Guard has not released this illustration.

Correct Answer: Option A — head pressure regulating valve

Head pressure regulating valves are installed in the high-side liquid and discharge lines of air-cooled refrigeration systems operating in cold environments. They maintain necessary operating head pressure by throttling condenser drainage during low ambient temperature conditions.