The running unloader of the device shown in...

🔍 Key Concepts

• Running unloader function on an air compressor (how it reduces output without stopping the compressor) • Difference between dumping air to atmosphere, holding suction valves open, and throttling the suction line • How the components labeled near the compressor suction (K, L, M) interact in the illustration

💭 Think About

• Trace the small control line from the governor/control device on the left side of the drawing to the mechanism at the compressor intake. What part actually moves when unloading occurs? • Ask yourself: when this mechanism operates, is the compressor still drawing in a full charge of air, drawing in a reduced charge, or not really compressing at all? • Look at whether any device in the system appears to vent air to atmosphere during normal running, or whether it simply changes how the compressor takes in air.

✅ Before You Answer

• Identify which item in the diagram is specifically the unloader mechanism and which is just a pressure-relief or safety valve. • Confirm whether any line from the unloader connects to an intercooler or only to the suction side/intake valves of the compressor. • Decide if the picture shows a valve that could hold open the suction valves internally versus a valve that only restricts flow in the suction piping.

The running unloader of the device shown in the illustration operates by __________. See illustration GS-0119.

temporarily discharging the compressed air to the atmosphere

holding open the high pressure stage reed-type suction valves

throttling a butterfly valve located in the compressor suction line

the use of an intercooler relief device

🔍 Key Concepts

💭 Think About

✅ Before You Answer