Which valve handles residual fuel drainage from the combustor after shutdown or a false start?

• A. Vent valve
• B. Fuel pressure relief valve
• C. Burner drain valves
• D. Diffuser bleed valve

Answer: (C)

Residual fuel in the combustor after shutdown or a false start must be drained to prevent pooling and potential re-ignition during restart. The burner drain valve provides a dedicated path from the burner area to the drain system, so any leftover fuel can be purged quickly from the combustor. This keeps the combustion system clean and lowers ignition risk on restart. The vent valve is for releasing pressure or gases, the fuel pressure relief valve protects the fuel system from overpressure, and the diffuser bleed valve removes air from the diffuser to manage flow—none of these drain the combustor’s residual fuel.