Turbo Cutoff - BENDIX AD-IP INTEGRAL PURGE AIR DRYER Manual

ORIFICE
CONTROL
PORT
PURGE
CONTROL
LINE
GOVERNOR
COMPRESSOR
FIGURE 5 - AD-IP ™ INTEGRAL PURGE AIR DRYER PURGE CYCLE
PURGE
VOLUME
CONTROL
PORT
SUPPLY
PORT
TURBO
CUTOFF
VALVE
PURGE
VALVE
FIGURE 6 - AD-IP ™ INTEGRAL PURGE AIR DRYER TURBO
CUTOFF
4
OIL
SEPARATOR
PURGE
SUPPLY
PORT
TURBO
ENGINE
CUTOFF
TURBO
VALVE
PURGE
DISCHARGE
VALVE
EXHAUST
The actual reactivation of the desiccant drying bed begins
as dry air flows from the purge volume through the purge
orifice in the desiccant cartridge bolt, then through the center
of the bolt and into the desiccant bed. Pressurized air from
the purge volume expands after passing through the purge
orifice; its pressure is lowered and its volume increased.
The flow of dry air through the drying bed reactivates the
desiccant material by removing the water vapor adhering to
it. Generally 30 seconds are required for the entire purge
volume of a standard AD-IP
desiccant drying bed.
The delivery check valve assembly prevents air pressure in
the brake system from returning to the air dryer during the
purge cycle. After the 30 second purge cycle is complete
the desiccant has been reactivated or dried. The air dryer is
ready for the next charge cycle to begin. However the purge
valve will remain open and will not close until air brake
system pressure is reduced and the governor signals the
compressor to charge the system.
TURBO CUTOFF FEATURE
The primary function of the turbo cutoff valve is to prevent
loss of engine turbocharger air pressure through the AD-IP
air dryer in systems where the compressor intake is
DESICCANT
BED
PURGE
VOLUME
DELIVERY
CHECK VALVE
(OLD STYLE
SHOWN)
PORT
™
air dryer to flow through the
(Refer to Figure 6)
™