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TIONCCo mm and Sign alMon itor PointS pool Po sitionMon itor PointPro port ional V alveSy mm etr ical S pool Nonsymm etrical S poolFigu re 1315 S ymb ols for t he flo w p ath s t hrough sym met rical and n ons ymm etr ical s poolCO P Y RI G HT (20 0 1 ) E A T O N CO RP O RA TIO NCP1P2P3P4MotorFi g u re 1 3 1 6 A s y m m e tri ca l s p o o l p ro p o rt io n a l v a lve c o n tro ls a n e q u a l a re a a c t u a to rC O P Y RI G H T ( 2 0 0 1 ) E A T O N C O R P O R A T IO NCP1P2P3P4Pr o p o rti o n a lV a lv eFi g u re 1 3 1 7 A s ym m e tri c a l sp o o l co n tro l c y li n d er e x te n si o nCO PY RI GH T (200 1 ) EA T ON C OR POR A TIO NCP1P2P3P4P ro po rti o na lV a lv eFi gu re 1 3 18 A s y m m et ric a l s po ol c o nt ro l c y lin de r r et ra c t io nCO PYR IG HT (2022) EA T O N CO RPO RA TIO NCT PA rmat ureCoi lS pindl eFigu re 1 31 9 Nozzl et ype p ressu re re lief va lveCO PYR IGHT ( 2022 ) EA T ON COR POR A T IONCFigu re 13 20 Pl ate typ e p re ssu re re lief v alv eCOP YRIGH T (200 1) E A T ON COR POR A TIO NCPBATFi gu re 13 21 N onf eed bac k t hr ot tle v alv eCO P YRI GHT (2022 ) E A T ON C OR POR A TIO NCPBAT PBATPBATCOPYRIGHT (2 00 1) EA T ON CORPO RA TIONCFigu re 132 2 Th ree spo ol o ptio ns for a non fee dbac k t hrot tle va lveFi gure 1323 Bernoulli forcesCOP YRIG HT (2 0 0 1 ) E A T ON CORP OR A TIONCLow ve locityhigh pre ssureareaHig h veloci tylow pressur eareaS pring forceSolenoid forcePress ure induced forcesL VDT Pos ition se nso rAir b lee dSPBATFig ur e 1 3 24 Th ro ttle va lve with feed ba ckCO PY RIG HT (20 0 1