When fuel flow is directed to the last zone by the fuel control the fuel flows directly to the upstream sprayring, while fuel flow to the downstream sprayring is controlled by a valve which is closed at {HEAD ~ a lower range} of {TAIL ~ bypass ratios} and open at a higher range of bypass ratios to direct fuel thereto, for spraying adjacent the outer wall 
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When fuel flow is directed to the last zone by the fuel control the fuel flows directly to the upstream sprayring , while fuel flow to the downstream sprayring is controlled by a valve which is closed at { HEAD ~ a lower range } of { TAIL ~ bypass ratios } and open at a higher range of bypass ratios to direct fuel thereto , for spraying adjacent the outer wall
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