32
Section 6:
Operation
Figure 6.6: Stage 3: Left Tower Drying, Right Tower Purging
•
At the completion of Stage 2, the right solenoid valve opens allowing the right exhaust shuttle valve to open. Air rushes
from the right tower out the silencer as it depressurises. For 120 seconds, a bleed of dry air from the outlet of the on-stream
(left) tower is directed through the right purge orifice and down through the right tower to regenerate the off stream (right)
desiccant bed.
