SKF SFD - Page 14

Twin Tower w/MLT
The descriptions detailed in this twin tower schematic represent the sequencing of airflow as it relates to
the actual drying process and transition - wet to dry - 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
1a Inlet Port wet air
enters dryer
4b Regen valve
"1" open
4b Regen valve
"2" closed
2b Wet air removed from
"2" desiccant bed
1b Outlet Port dried air
flows to system
3a Dried air leaves
"1" desiccant bed
3a Dried air enters
"2" desiccant bed
1b Outlet Port wet air
exhausted from dryer
2a Wet air enters
"1" desiccant bed
1
2
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