🔍 Key Concepts

• Follow the color code in the diagram (suction, liquid, discharge) to see what lines the quench valve connects between. • Think about what a quench valve does in a refrigeration system that uses hot-gas bypass / capacity control at low load. • Consider why you might need to cool or dilute hot gas returning to the compressor to protect it.

💭 Think About

• From the illustration, does the quench valve tie a branch from the liquid line into the suction line, or from the suction line into the liquid line? • Are quench valves normally used when the evaporator load is very high or when it is very low? How does that affect suction gas temperature? • If hot gas is being bypassed toward the suction side, what extra step might be needed to keep the compressor from overheating or the suction superheat from getting too high?

✅ Before You Answer

• Verify which color (suction, liquid, or discharge) is on each side of the quench valve in the schematic. • Check the flow arrows around the quench valve: in which direction is the refrigerant moving and into which line is it entering? • Ask whether the quench valve’s main job is to protect the compressor during low-load / hot-gas bypass operation or to boost system capacity at high load.