- It is used in large evaporators , where pressure drop take place at the end of evaporator ie, more than 0.3 bar
- The pressure acting outsode the bellow from heat sensing bulb and capillary tube is total of the saturation pressure plus superheat . This pressure is trying to open the valve , overcoming the spring pressure.
- The equilizing line has saturation pressure at the end of an evaporator coil acting from the bottom of the bellow ( diaphram ) . Hence the saturation pressure from equalizing line and capilliary tube is balancing each other.
- The additional pressure from outside of bellow due to superheat is now reaponsible to open the expansion valve. By this arrangement , we are getting actual degree of superheat . Correct degree of superheat ensure that refrigerant is used efficiently and no liquid reaches to compressor suction . Also evaporator shoulf not starved of refrigerant.
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