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

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

Accepted Answer

Option C: C. An automatic expansion valve, or evaporator pressure regulator, maintains a constant pressure within the evaporator rather than regulating superheat. It responds directly to evaporator pressure changes via an internal diaphragm or bellows opposed by an adjustable spring.