21
Pro Dry Instruction Manual
|
Walker Filtration
|
www.walkerfiltration.com
Section 5:
Operation
Figure 5.3: Process & Instrumentation diagram (PD004 – PD035)
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.
1. Air inlet
2. Connecting tube
3. Inlet shuttle valve
4. LH desiccant bed
5. LH built in dust filter
6. Outlet shuttle valve
7. Air outlet
8. RH exhaust valve 2/2 NC
solenoid valve
9. Exhaust silencer
10. Purge valve
11. RH desiccant bed
12. RH built in dust filter
13. LH exhaust valve 2/2 NC
solenoid valve
14. Left diaphragm control valve
15. Right diaphragm control valve
Stage
Time (Seconds)
SV Valve Status
Dryer Operation
1.
0
Left valve closed, right valve opens
Left tower at pressure (drying), right tower depressurises and
Then purges
(this stage is shown on pd1 pneumatic schematic
)
2.
120
Both valves closed
Right tower repressurising
3.
170
Left valve opens, right valve closed
Left tower depressurises and then purges, right tower at pressure
(drying)
4.
290
Both valves closed
Left tower repressurising
340
Back to stage 1
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