🔍 Key Concepts

• Trace the air flow path from the compressor discharge to the receiver sump and then to the control box during normal operation (50–100 psi). • Consider the purpose of the moisture bleed valves versus the main line/stop valves—when are they normally open or closed? • Relate each labeled component (B, D, G, H) to whether it is used for continuous operation or for draining/isolating the system.

💭 Think About

• If the system is running normally at 50–100 psi, which valves must be open to allow air to travel from the compressor to the control box? • Which of the labeled components would you expect to be opened only during maintenance or when removing moisture/condensate from the system? • Look at which components connect directly to the receiver and main line—would a normally closed valve in that spot allow the gauges and instruments to show line pressure?

✅ Before You Answer

• Verify which lettered component is in the main supply path (not just a drain or bleed line). • Check which lettered components are clearly marked or drawn as moisture bleed or drain valves—these are typically closed in normal operation. • Confirm that the component you select would reasonably be open continuously whenever the compressor is supplying air at 50–100 psi.