The complete ADU (Air Dryer Unit) operates in following three modes:
Drying Mode:

The wet saturated compressed air coming from set of pre filters is led through one of the inlet valve (controlled by electronic timer) to the desiccant bed tower.The highly hygroscopic desiccant bed with sufficient air resident time due to proper velocity results in absorbing the moisture vapour and dries the air to desired level of dew point

Regeneration Mode:

The small amount of dried air at almost atmospheric pressure is led through purge line to the saturated desiccant bed tower.The absorbed moisture in desiccant bed at earlier drying mode is desorbed in purged dry air and regeneration takes place.

Pressurisation Mode:

To avoid the pressure fluctuations at outlet of dryer,the regeneration mode tower is put in for pressurisation before it switches to drying mode.
The entire operation is electronic timer controlled and automatic at various modes shown above for proper sequence and timing.The total cycle time is 10 minutes or  as per timer selection for required dew point.

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