Farm Power & Machinery

Pressurized cooling

 
• In this type of cooling, the system is made tight enough to bear the additional pressure (Fig. 5.4). A special spring loaded cap for the radiator is provided to withstand the pressure. An overflow pipe is fitted above the spring loaded part of the cap. There is a vacuum relief disc, a spring and the pressure cap. When the engine cools, the water level in the radiator goes down and a vacuum is created. The vacuum operates the disc which is pushed down to save the radiator tubes from collapsing. With the increase in pressure, the boiling temperature of water increases from 100oC to 172oC. The higher water temperature gives more efficient engine performance and is useful at high altitudes.
  Fig. 5.4 Pressurized cooling system