Which of the following illustrated expansion valves is designed to maintain a constant evaporator pressure rather than a constant evaporator superheat? GS-RA-24

Illustration GS-RA-24: the U.S. Coast Guard has not released this illustration.

Question

Which of the following illustrated expansion valves is designed to maintain a constant evaporator pressure rather than a constant evaporator superheat? GS-RA-24

Illustration GS-RA-24: the U.S. Coast Guard has not released this illustration.

Accepted Answer

Option B: C. Automatic expansion valves (or evaporator pressure regulators) are designed to maintain a constant evaporator pressure rather than superheat, utilizing a pressure-actuated diaphragm opposed by an adjustable spring to regulate refrigerant flow regardless of load fluctuations.