In the multi-evaporator refrigeration system shown in the illustration, what is the proper name for the valve labeled "29"? Illustration GS-RA-12 Illustration GS-RA-12: the U.S. Coast Guard has not released this illustration.

Correct Answer: Option B — chill box thermostatic expansion valve

Component 29 in multi-evaporator refrigeration diagrams represents the thermostatic expansion valve supplying liquid refrigerant to the chill box evaporator. It meters flow based on evaporator superheat, protecting the compressor from liquid slugging while maintaining proper box temperatures.