Refrigeration relief valves are usually on the liquid ______.

• A. Condenser
• B. Suction line
• C. Receiver
• D. Evaporator

Answer: (C)

Relief devices on refrigeration systems are placed on the high-pressure liquid side to prevent overpressure from damaging the vessel and piping. The liquid receiver sits on that side, collecting condensed liquid refrigerant before it goes to the metering device. Installing the safety valve on the receiver means any excess pressure in the liquid line is vented before it can force components or lines beyond their rated limits. The other options don’t fit the purpose well: the condenser deals with high-pressure vapor-to-liquid transitions, the evaporator and suction line operate primarily on the low-pressure side and contain mostly vapor, so a valve here would not manage liquid pressure in the same way.