Extrol 30

Initial position of the entire volume of the Extrol 30 is filled with gas. The Expansion tank under the influence of air pressure is pressed to the inner surface of the tank. As the temperature in the fluid volume increases, pressure increases, and the coolant enters the expansion tank, squeezing the Expansion tanks. At the same time the air in the opposite chamber pot shrinks. The disadvantage of this design is its inability to replace the Expansion tank if it is the gap or high water permeability. However, in the heating systems in their normal operation, the maximum expansion of the liquid occurs only at the time of launch. In other cases, the pressure varies smoothly, without major shocks and vibrations. Consequently, in the tanks are quite long. You only need to pre-season heating check the air pressure in the tank.