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Until sufficient pressure is attained in the fuel control to compute the fuel flow schedules, flow to the main fuel nozzle is prevented by the pressurizing and drain dump valve. This valve also drains the fuel manifold at engine shutdown to prevent post-shutdown fires, and it traps fuel in the upstream portion of the system to keep the fuel control primed to permit faster starts.

All manufacturers install a combustion chamber drain valve in the combustion section. During normal engine operation this valve is closed. The drain valve is located at the lowest part of the combustion chamber. When the combustion pressure in the chamber drops below a specified minimum, usually a few pounds per square inch, this valve opens and drains any fuel remaining after a false or aborted start. The fuel drained from this valve is dumped overboard.



David L. Heiserman, Editor

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Revised: June 06, 2015