Flow diagram CD 25+ up to CD 50+
Reference Designation Reference Designation
1 Air inlet 7 Air outlet
2 Inlet selector valve 8 Left solenoid valve
3 Left desiccant tower 9 Right solenoid valve
4 Right desiccant tower 10 Silencer
5 Purge nozzle 11 Silencer
6 Outlet selector valve PI Pressure gauge
Operation principle basic control version
The operation cycle of the dryer is repetitive and is controlled by a factory-set timer. While the
desiccant in one tower dries the compressed air, the desiccant in the second tower is being
regenerated. Regeneration of the desiccant is achieved by means of purge air from the drying
tower.
The compressed air entering the dryer is led to one of the towers by means of the bottom
selector valve. The position of the selector valve depends on the condition (activated or not) of
the solenoid valves. As the air flows upwards through the tower, the desiccant adsorbs the water
vapour and the compressed air is dried.
Once the top of the tower is reached, the air leaves the dryer via the outlet valve (= top selector
valve).
A small portion of the dried air passes a nozzle, expands to atmospheric pressure and flows
downwards through the other tower, regenerating (drying) the desiccant. A nozzle for operation of
the dryer at 7 bar is installed as standard. Alternative nozzles for use at other operating
pressures are available as sales kit, see section Technical data. The regeneration air is released
via the corresponding solenoid valve and the silencer. The solenoid valves are controlled by the
timer.
Instruction book
API093050 11
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