CARO - Certified Assistant Refrigeration Operator Practice Test
CARO Piping Systems and Valves
What is the primary purpose of a hand expansion valve (HEV) in an ammonia refrigeration system?
Select your answer
A
To automatically regulate refrigerant flow based on superheat
B
To manually control refrigerant flow into a vessel or evaporator
C
To relieve excess system pressure during emergencies
D
To separate liquid refrigerant from vapor in the suction line
Hint
