🔍 Key Concepts

• Function of discharge valves in refrigeration compressors • How liquid slugging affects compressor valves and pistons • Difference between pressure control/equalization devices and simple mechanical check-type valves

💭 Think About

• Which option best matches a simple mechanical action of a thin, flexible plate opening and closing with flow, rather than a control or regulating function? • Think about what happens if liquid refrigerant accidentally enters the cylinder on the discharge stroke—what kind of valve feature would help protect the compressor? • Which options describe system-wide control functions (pressure equalization, capacity control, defrost) that are usually handled by separate control valves rather than by a small discharge check valve?

✅ Before You Answer

• Identify which choice relates directly to protecting the compressor itself rather than controlling the system cycle • Ask whether a flapper/beam valve can realistically meter or regulate pressure between lines, or if it mainly opens/closes with flow • Eliminate any options that normally require separate control valves and piping, not just a simple discharge valve design