The reason for sustainable oil and air drying in the tank is based on two effects:
Follow-up flow of dry air.
With each inflow of fresh, dry air, the internal tank air and the water molecules it contains are homogeneously mixed. This causes the humidity in the tank to drop permanently. The steadily drying air removes moisture from the oil by equilibrium excitation, but slowly. The drying of the internal tank air takes place quickly with a high number of cycles and is clearly visible in the water content of the laboratory reports.
Active drying of the air inside the tank
Silica gel has a highly hydrophilic surface and strongly attracts polar substances such as water (H2O). As a result, even when the system is not in operation, the moisture inside is adsorbed by the silica gel, thus drying the internal air. The adsorbers of the VARIO series are used as aerators and deaerators. This means that every time the cylinders are retracted, the air is forced out into the environment by the silica gel. If this air is dry, the silica gel is partially regenerated and the service life of the adsorber is extended many times over. However, if this air is moist, active drying takes place and thus discoloration of the adsorber from above (air flows out of the system into the environment). This can be seen very clearly when the adsorbers are used on the plastic injection molding machine.