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www.bendix.com 1-800-AIR-BRAKE (1-800-247-2725)
Air Dryers
The air dryer is an in-line filtration system that removes
both water vapor and oil droplets from the compressor
discharge air after it leaves the compressor. This results
in cleaner, drier air being supplied to the air brake
system, and aids in the prevention of air line and
component freeze-ups in winter weather.
Air dryers typically use a replaceable cartridge
containing a desiccant material and an oil separator.
Most of the oil droplets are removed by the oil
separator as the air passes into the air dryer. The air
then moves through the desiccant material which
removes most of the water vapor.
When the air pressure in the supply air tank reaches
the required level, the governor makes the compressor
stop building air and allows the air dryer’s “purge cycle”
to begin. During the purge cycle the desiccant material
is regenerated (its ability to remove water is renewed)
by a reversal of the saturation process. A small amount
of dry air passes back through the desiccant material
and the water that has been collected, as well as any oil
droplets collected by the oil separator, are purged out
through the base of the dryer. It is normal to see a
small amount of oil around the purge valve.
The air dryer end cover is typically equipped with an
(12 or 24 volt) integral heating element.
The AD-2
™
, AD-4
™
, AD-9
™
and AD-IP
™
air dryers
are designed with an internal storage (“purge volume”)
of dry air for the purge cycle.
The AD-IS
™
air dryer is an integral purge air dryer
module, which includes a spin-on desiccant cartridge,
governor, reservoir and charging valve components in
a module. These have been designed as an integrated
air supply system. The DRM
™
module includes an
AD-IS
™
integrated solution air dryer, a reservoir
(including a separate purge reservoir section), a
governor, and four pressure protection valves as an
integrated air supply system.
“Extended Purge” air dryers are designed with an
extra amount of air storage internally that is used to
assist in the purge cycle. An example is the AD-IP
™
EP air dryer.
Several Bendix air dryers are available in specialized
“Drop-in” versions designed especially for air systems
that use either the Holset (Cummins) Type E or QE air
compressor. These Holset compressors utilize an
unusual unloading system that requires that air pressure
remain in the discharge line during the entire unloaded
cycle of the compressor. For example, the AD-IP
™
“Drop-in” version is shown here.
Air Dryers
AD-IS
™
Air
Dryer
Module
AD-IP
™
Air
Dryer
AD-9
™
Air
Dryer
AD-2
™
Air
Dryer
AD-4
™
Air
Dryer
(only available
reman.)
Feedback
Line
Special Discharge Port
Fitting w/Feedback Line
Connection
AD-IP
™
Air
Dryer
(“Drop-in”
version)
Dryer
Reservoir
Module
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