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Bleed Valves
The PT6 engine uses a compressor bleed valve to prevent compressor stalls at low engine speeds. At low gas generator speed the axial stages of the compressor produce more air than the centrifugal stage of the compressor can handle. The bleed valve dumps this excessive volume of interstage compressor air (P2.5) and then automatically closes at high gas generator speeds when the impeller can handle all of the air.
Some engine models use two compressor bleed valves, one high pressure and one low pressure ...more about PT6 bleed valves
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