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er /Fe ed ba ck W ir eS poo lF ilterOri ficeF igur e 1 46 F lapp er ass em bl y co nn ec ted to the s po olC OPYRIGH T (2 001 ) EA T ON C OR POR A TIONCN NSSSNFigure 14 7 Deflected Flapper Increases Pr essure Behind One NozzleCOPYRIG H T (2 001) E A T ON CO R PO RA TIONCN NSSSNFigure 14 8 S pool Movement Center s Flappe r , Neutr alizing S pool F orcesCO PYRIGH T (200 1) EA T ON C OR POR A T IO NCS le e v eN u l l a d j u s tm e n t s l o tN u l l a d j u s te rF ig u re 1 4 9 S p o o l m o v