22
Pro Dry Instruction Manual
|
Walker Filtration
|
www.walkerfiltration.com
Section 5:
Operation
1. Air inlet
2. Down pipe
3. Inlet shuttle valve
4. LH desiccant bed
5. LH dust filter
6. Outlet shuttle valve
7. Air outlet
8. RH exhaust valve 3/2 NO
solenoid valve
9. Exhaust silencer
10. Purge valve
11. RH desiccant bed
12. RH dust filter
13. LH exhaust valve 3/2 NO
solenoid valve
Figure 5.4: Process & Instrumentation diagram (PD045 – PD365)
Note: Diagram shown in one of
six possible positions, Left Tower
Drying, Right Tower Purge.
Certain feature are intentionally
shown out of position for reasons
of clarity.
Stage
Time (Seconds)
SV Valve Status
Dryer Operation
1.
0
Left valve closed, right valve opens
Left tower at pressure (drying), right tower depressurizes and
Then purges
(this stage is shown on pd2 pneumatic schematic
)
2.
120
Both valves closed
Right tower repressurizing
3.
140
Left valve opens, right valve closed
Left tower depressurizes and then purges, right tower at
Pressure (drying)
4.
260
Both valves closed
Left tower repressurizing
280
Back to stage 1
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