BENDIX AD-IS - Service Data - Page 3
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OIL COALESCING FILTER
(BENDIX
AD-IS
PURAGUARD
®
®
OIL COALESCING AIR DRYER)
DELIVERY
CHECK VALVE
(CLOSED)
PURGE
CONTROL
CHANNEL
GOVERNOR
UNLOADER
PORT
SUPPLY
PORT
PURGE VALVE
(OPEN)
COMPRESSOR
®
FIGURE 3 - BENDIX
AD-IS
safety valve, heater and thermostat assembly, pressure
protection valves, threaded air connections and the purge
valve assembly.
The removable purge valve assembly incorporates the
purge valve mechanism and a turbocharger cut-off feature
that is designed to prevent loss of engine "turbo" boost
pressure during the purge cycle of the Bendix
dryer and reservoir system. For ease of maintenance, all
replaceable assemblies can be serviced without removal
of the air dryer and reservoir system from its mounting on
the vehicle. Refer to Preventive Maintenance section.
DESICCANT
BED
®
TURBO
SAFETY
CUT-OFF
VALVE
VALVE
SECONDARY
ENGINE
(CLOSED)
PORT (SEC)
TURBO
EXHAUST
®
AIR DRYER AND RESERVOIR SYSTEM PURGE CYCLE
®
AD-IS
PRESSURE
PROTECTION
VALVES
A
C
B
PRIMARY
PORT (PRI)
PRIMARY
RESERVOIR
AUXILIARY PORTS
(TO ACCESSORIES)
®
BENDIX
AD-IS
SYSTEM OPERATION: GENERAL
(Refer to Figure 2.)
The AD-IS air dryer and reservoir systems are designed to
receive compressed air from the vehicle air compressor,
clean and dry the air, deliver air to the vehicle's primary
®
air
reservoir, secondary reservoir and accessories, and control
the compressor/dryer charge cycle.
PURGE
PURGE
RESERVOIR
ORIFICE
D
PURGE
RESERVOIR
DRAIN VALVE
SECONDARY
RESERVOIR
DIAGRAM SHOWS ALL PRESSURE
PROTECTION VALVES OPEN.
®
AIR DRYER AND RESERVOIR
3