24 | Walker Filtration
9. Operation
The dryer operation is designed to give smooth, uninterrupted delivery of compressed air
to the designated specification.
During the cycle of operation, the first pressure housing is fully pressurized and airflow is
directed upwards through the desiccant cartridge, removing moisture from the air during
its passage, to the minimum specified dewpoint.
During the drying cycle, a small bleed of dry air (purge) is directed to the opposite
pressure housing. This purge air flows down through the desiccant cartridge and to
atmosphere by means of an exhaust silencer, thereby effecting regeneration of the
desiccant.
After 120 seconds of operation, the cartridge under regeneration is sealed by closing of
the exhaust valve and the pressure housing is brought up to full system pressure by the
purge air.
After 170 seconds, the pressure in the first housing is released to atmosphere by means
of the corresponding exhaust valve and the desiccant cartridge then operates in
regeneration mode. The main air flow and drying function is then transferred to the
desiccant cartridge that was previously under regeneration.
The cycle of operation continues in this pattern with the cartridges switching alternately
between drying and regenerating.
