Question 130Refrigeration & AC - 1st Asst/Chief

The correct answer is D) the individual thermal expansion valves. In refrigeration systems with multiple evaporators, the metering of refrigerant to each refrigerated space evaporator is accomplished by individual thermal expansion valves. These valves automatically regulate the flow of refrigerant to each evaporator based on the temperature and pressure within that specific refrigerated space, ensuring proper superheat and efficient cooling. The other options are incorrect because: A) back pressure regulating valves control the pressure at the outlet of the evaporator, not the metering of refrigerant; B) the king valve is used to isolate the entire refrigeration system, not individual evaporators; and C) box solenoid valves are used to on/off control the refrigerant flow, not to meter it.