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Air Techniques, Inc.
Air Techniques, Inc.
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Introduction and General Advice
1.3.3
Function description with drying installation (D-Units)
The following provides the functional description for product units ASE121D, ASE122D,
ASE220D, ASE250D, ASE450D and ASE600D.
Each product consists of a (multiple) piston compressor(s), a pressure tank, a tank outlet
assembly (control gear) with operating and safety elements, a cooler and a membrane
dryer.
See Figure 1b. Via the air intake filter (9), atmospheric air is aspirated. This air will be
compressed by the piston in the cylinder(s) (1). The inlet or outlet valve shuts off flow in
one direction, so the compressed air is made to lead into the pressure hose (10) which
leads the compressed air to the cooler (7), then the membrane dryer (8) through the
check valve into the pressure tank (2).
The temperature of the air entering the cooler is lowered substantially prior to entering
the unit’s membrane dryer. At this point, the majority of liquid water is condensed from
the air stream by the coalescent filter and is removed through the automatic drain valve.
The remaining moisture in the air is finally purged from the air-stream using hundreds of tiny
membrane fibers that wick away all remaining saturation. The 100% moisture-free air flows
through the check valve to the tank.
For regeneration, a small portion of air is directed via the purge nozzle to the outside
walls of the membrane fibers. This regeneration happens continuously during operation.
The compressor aggregate (1) generates compressed air as long as the Main power /
pressure switch (3) signals that the adjusted cut-out pressure is not reached. The pressure is
indicated by the pressure gauge (5). Excessive pressure will be released by the integrated
safety relief valve (6).
The tank pressure reduces when being used for procedures. On reaching the cut-in
pressure the compressor aggregate will be automatically restarted by the Main power /
pressure switch.
