🔍 Key Concepts

• Trace the flow path from the start air reservoir, through valve A, to the outlet toward the air control reservoir in each position I–IV. • Identify which position of valve A provides a direct or alternative path that does not depend on valves B, C, E, and F all operating correctly. • Think about how a bypass position is usually drawn in pneumatic schematics (look for a position that connects inlet to outlet while avoiding sensitive control components).

💭 Think About

• For each position I–IV, which ports of valve A are connected? Follow the arrows in the symbol and sketch the flow path to the right side of the diagram. • If one of the downstream valves (B, C, E, or F) were to stick closed, in which position of valve A would air still have a way to reach the outlet line toward the air control reservoir? • Is there a position where valve A routes air only through the pressure‑reducing and safety devices, and a different position where it allows air to bypass those devices? Which one would better ensure continuous flow even during failure?

✅ Before You Answer

• For each position, verify which ports are actually connected inside valve A; don’t rely on the labels alone—use the arrows in the valve symbol. • Confirm whether the chosen position still allows a path to the outlet if one of the parallel branches (through B or C) is blocked. • Double‑check that the position you pick would not completely depend on the proper operation of component F (final regulating valve) for any flow to pass.