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1、2006/09/12 MAN Diesel A/SExhaust valve systemExhaust valve actuator3) Special runningconditions2006/09/12 MAN Diesel A/SHydraulicExhaust valve systemMC versus ME2006/09/12 MAN Diesel A/SExhaust valve actuatorS70ME-C2006/09/12 MAN Diesel A/SThe FIVA valve which drives the actuatoron the exhaust side
2、has two positions,open or shut. When it is opened with a engine control system, the hydraulic oil is forced in and pushes the pistons upwards,thusopening the engines exhaust valve via thehydraulic push rod. The pressure is permanently maintaineduntil the FIVA valve is the pressure when the required
3、exhaust phaseis completed.The exhaust valve is returned to its closed position by the force from the air spring. Unpressurised hydraulic oilPressurised hydraulic oilFIVAActuatorExhaust valve actuatorworking principle2006/09/12 MAN Diesel A/SS50MC-C S50ME-CHydraulic damper for fixed valve stroke New
4、valve spindle design introducedExhaust valveMC versus ME2006/09/12 MAN Diesel A/SSelf-adjusting damper pistonHydraulic nut/measuring coneAir inletContact less sensor with integrated electronicsME Exhaust valve2006/09/12 MAN Diesel A/SME Exhaust valve2006/09/12 MAN Diesel A/SME Exhaust valveClosed po
5、sitionDamper function opening strokeDamper function closing strokeSealing oil control unit2006/09/12 MAN Diesel A/SSealing oil control unitSealing oil2006/09/12 MAN Diesel A/SOil inlet to damperDrain pipesFeed back sensorME Exhaust valveSealing oil control unit2006/09/12 MAN Diesel A/SConical nut200
6、6/09/12 MAN Diesel A/SConical nut - tightening2006/09/12 MAN Diesel A/SExhaust valve adjustmentsAdjustment of exhaustvalve closing timeAdjustment of exhaustvalve opening time2006/09/12 MAN Diesel A/SSpecial running conditionsS50ME, open exh-valveCheck pressure free at “minimess” point 455CloseOpen20
7、06/09/12 MAN Diesel A/SConnect the mini-mesh hose between top flange on actuator point 425at the hydraulic block Special running conditionsS50ME2006/09/12 MAN Diesel A/SSpecial running conditionsS50MECloseOpen2006/09/12 MAN Diesel A/SCheck pressure free at “minimess” point 455Special running conditi
8、ons60 - 98ME, open exh-valveOpen2006/09/12 MAN Diesel A/SSpecial running conditions60 98MEClose valve 531 toshut off oil to damper2006/09/12 MAN Diesel A/SDrain off air pressure from air cylinder with a mandrelSpecial running conditions60 98MEDisconnect airsupply to air springCheck that the exh. val
9、ve spindle hasmoved to open position on theperating Panel, Maintenance System View I/O Test CCU, Ch 342006/09/12 MAN Diesel A/SRemove plug screw and mount tools tokeep exhaust valve spindle openSpecial running conditions60 98ME2006/09/12 MAN Diesel A/SReconnect air supply under air pistonOpen damper
10、 oil supplyValve 531Special running conditions60 98ME2006/09/12 MAN Diesel A/STest of exhaust valve2006/09/12 MAN Diesel A/STest of exhaust valveAfter setting the CCU in Test mode, set output Ch 49 to ON, the exhaustvalve will open if hydraulic pressureand spring air are present.Changes the output ON/OFF
