All hydraulic test has to done by water because in pressure testing we are checking for weakness in air bottle .Hydraullic pressure test to be done above 50% at design pressure . If the air bottle was actually having a hole , then it will take atleast half hour for the pressure to be released , till that time the weak air bottle is pressurised .But in hydruallic pressure test even one drop escapes , the pressure is released because the water is incompressible
The electrohydraulic control mechanisms of the ME engine replace the following components of the conventional MC engine: Chain drive for camshaft Camshaft with fuel cams, exhaust cams and indicator cams Fuel pump actuating gear, including roller guides and reversing mechanism Conventional fuel pressure booster and VIT system Exhaust valve actuating gear and roller guides Engine driven starting air distributor Electronic governor with actuator Regulating shaft Engine side control console Mechanical cylinder lubricators. The Engine Control System of the ME engine comprises: Control units Hydraulic power supply unit Hydraulic cylinder units, including: Electronically controlled fuel injection, and Electronically controlled exhaust valve activation Electronically controlled starting air valves Electronically controlled auxiliary blowers Integrated electronic governor functions Tacho system Electronically controlled Alpha lubricators
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