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The housing assembly consists of two cylindrical steel

stampings welded together. For piping convenience, two

inlet ports – one reservoir port and one purge volume

port – are provided in the Bendix

outlet port of the AD-2 air dryer incorporates an integral

single check valve with the top port used for the addition

of purge volume. (Refer to Figure 2.)

A safety valve mounted in the housing assembly protects

against excessive pressure build-up within the housing.

The desiccant sealing plate assembly is located mid-way in

the housing assembly and houses a replaceable ball-type

single check. Also located in the plate assembly is the

purge oriﬁ ce.

PURGE

VOLUME

PURGE

ORIFICE

19-1/2"

INLET

DESICCANT

"O" RING

HEATER

BENDIX

Figure 2 – Sectional Views

AD-2

air dryer. The side

5-1/2"

OUTLET

"O" RING

FILTER

PURGE

VALVE

DEFLECTOR

AD-1

™

AIR DRYER

The desiccant cartridge and aluminum oil separator ﬁ lter

are removable and comprise a complete serviceable unit.

The desiccant beads, which are referred to as the "drying

bed", are a drying substance that has the unique property

of exposing a tremendous surface area in proportion to

its bulk. One pound of the desiccant beads has about two

million square feet of adsorptive area made up of a large

number of submicroscopic cavities in each bead. Each

desiccant bead adsorbs or collects moisture.

The desiccant beads are held in place by steel perforated

plates and ﬁ lter cloths. The top plate is held in place

by a spring, and the bottom plate rests on a shoulder

approximately 1/8" from the bottom of the cartridge housing.

MOUNTING

BRACKET

LOCK

NUT

CHECK

DESICCANT

VALVE

SEALING

PLATE

"O" RING

INLET

SAFETY

VALVE

CARTRIDGE

BOLT

MOUNTING

BRACKET

DESICCANT

CARTRIDGE

OIL

PURGE

RETAINING

VALVE

RING

PISTON

CONTROL

PORT

EXHAUST

PURGE

ELECTRICAL

VALVE

TERMINAL

BENDIX

AD-2

AIR DRYER

CHECK

VALVE

OUTLET

LOCK

NUT

SPRING

RETAINER

PERFORATED

PLATE

OIL

FILTER

HEATER

THERMOSTAT

ENCLOSURE