In the multi-evaporator refrigeration system...

🔍 Key Concepts

• Follow the refrigerant flow to and from the freeze box evaporator J and note which components directly control liquid refrigerant entering that coil. • Recall how a thermostatic expansion valve (TXV) is drawn symbolically versus a simple solenoid valve in refrigeration schematics. • Consider the function of an evaporator pressure regulating valve (EPR) and where it is normally installed in relation to the evaporator (inlet vs outlet side).

💭 Think About

• Look at valves 34, 35, 36, and 37 around the freeze box branch. Which one is clearly the on/off device, and which one meters refrigerant in response to temperature/superheat? • Compare the symbol used for valve 37 with the symbol used for the chill box expansion device feeding evaporator K. Are they similar or different, and what does that tell you about the type of valve? • Think about which component would be controlled by a thermostat in the box versus which would be controlled by suction pressure—where would each normally be labeled in a multi‑evaporator system?

✅ Before You Answer

• Verify which evaporator is the freeze box (J) and which is the chill box (K) in the illustration before deciding. • Confirm whether valve 37 is on the liquid line into the freeze box coil or on the suction line out—this is critical for distinguishing TXV from EPR. • Check if there is a separate solenoid symbol (typically a box or coil symbol) in series with the metering device for the freeze box; identify which number that solenoid carries so you don’t confuse it with valve 37.

In the multi-evaporator refrigeration system shown in the illustration, what is the proper name for the valve labeled "37"? See illustration GS-RA-12.

freeze box solenoid valve

freeze box evaporator pressure regulating valve

chill box thermostatic expansion valve

freeze box thermostatic expansion valve

🔍 Key Concepts

💭 Think About

✅ Before You Answer