🔍 Key Concepts

• Suction service valve function in a refrigeration system and where it is located in relation to the compressor and evaporator • Flow path of refrigerant vapor from the evaporator back to the compressor • How port 7 in the illustration lines up with the internal passage when the valve is in normal operating position

💭 Think About

• Trace the normal refrigerant flow in a vapor‑compression system: condenser → expansion device → evaporator → ? → ? • Look at the cutaway: if D is a suction service valve, which side must be toward the low‑pressure line, and which side must be toward the compressor? • Ask yourself: when the valve is fully open in normal operation, what does port 7 actually connect into inside the valve body?

✅ Before You Answer

• Confirm which component in the system is on the suction (low‑pressure) side of the compressor • Visualize how service valves are usually installed: they sit directly on the compressor with the line from the evaporator attached to one end • Make sure port 7 is identified as the end that would be brazed or screwed into the suction line coming from another component