Beko Drypoint ACC 4 Instruction/Technical Manual page 21

Section 5: Operation
Figure 5.4: Stage 1: Left Tower Purging, Right Tower Drying
Figure 5.4: Stage 1: Left Tower Purging, Right Tower Drying
The left solenoid is energized allowing air on the outside of the diaphragm to vent through the solenoid valve to atmosphere. As air pressure on the outside of the
diaphragm drops, the diaphragm is pushed away from the valve seat by the internal air pressure of the dryer and air rushes out the silencer as the left tower depressur-
izes.
The shuttle valves move to the lower pressure (left) side and seal off against the main process flow.
Once the tower pressure drops, dry, purge air passes from the outlet of the right tower into the top of the left tower via the purge orifice. The air then flows down through
the left desiccant bed evacuating the trapped moisture and venting it to atmosphere.
1.0 µ
Water
Pre-Filter
Separator
IN
TIMING CHART:
SV 1
(Left Solenoid Control Valve)
SV 2
(Right Solenoid Control Valve)
DV 1
(Prefilter Drain Solenoid Valve)
Seconds: 0
Heatless Desiccant Dryers |
Alternate Inlet
To Bottom Valve
Left
S.V.
120 170
Instruction Manual
Alternate Outlet
Right
S.V.
ON
OFF
ON
OFF
2 Seconds
ON
OFF
290 340
0.01 µ
After Filter
OUT
LEGEND:
Wet
Purge
Dry
21