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The pressurising function of the pressurising and dump valve in a gas turbine engine fuel system is to…

  • A
    prevent fuel leakage in the combustion chamber after engine shut-down.
  • B
    allow fuel to the nozzles only if the fuel pressure is high enough for sufficient atomisation.
  • C
    allow oil to the fuel-oil heat exchanger, preventing ice crystals blocking the fuel lines.
  • D
    prevent overpressure at the fuel nozzles.
The pressurizing and dump valve allows fuel to the nozzles only if the fuel pressure is above a preset value that will ensure proper atomization. Upon engine shut down, the dump valve will close and dump the fuel in the drain tank or return it to the fuel tank in order to avoid that the fuel boils due to residual engine heat.
 

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