D-2
Z MED Medical Air System
4107 9022 67.00
Appendix D - Desiccant Dryer
D.2 Basic Dryer Operation
CD35 - CD65 (See FIG D.2)
The construction of the air dryer is simple,
reliable and easy to service. A dryer module
basically consists of two towers, containing the
adsorption material or desiccant. The desiccant
is a very porous grain material, able to adsorb
large amounts of water vapor.
The operation cycle of the dryer is repetitive
and is controlled by a factory set timer in the
controller or by the PDP sensor (pressure
dewpoint sensor), which is optionally available.
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 one of the
two 3–2 valves. The position of the 3–2 valves
is controlled by the solenoid valves. As the air
flows upwards through the tower, the desiccant
adsorbs the water vapor and the compressed
air is dried. The dried air leaves the dryer via the
outlet check valve.
A small portion of the dried air passes a
nozzle, expands to atmospheric pressure and
FIG D.2 CD35 - CD65 Flow Schematic
Содержание Z MED Medical Air System
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