SKF SFD - Flow Diagrams

FLOW DIAGRAMS
Internal Purge Twin Tower w/MLT
The descriptions detailed in this internal purge schematic represent the sequencing of airflow as it relates
to the actual drying process and transition – wet air to dry air - within all dryer systems including both
Programmable Logic (PLC) and Pneumatically Controlled (PC) systems
Wet Air
Transition Air
Dry air
Internal Flows
Total Cycle Sequence 240 sec.
Cartridge 1 receives wet air for 120 sec. while cartridge 2 regenerates for 120 for sec. - MLT switches
Cartridge 2 receives wet air for 120 sec. while cartridge 1 regenerates for 120 for sec. - MLT switches
1b Outlet Port dried air
flows to system
3b Wet air removed from
"2" desiccant bed
4a Dried air enters
"1" purge reservoir
check valve open
1a Inlet Port wet air
enters dryer
4b Wet air exits"2"
internal reservoir via
orifice
(check valve closed)
2a Check valve
"1" open
2b Check valve
"2" closed
1b Outlet Port wet air
exhausted from dryer
3a Wet air enters
"1" desiccant bed
1
2
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