Bendix Commercial Vehicle Systems BX2150 AIR COMP (BW1424) - Manual (Page 4)

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instead, ice blockages occur at the air dryer or reservoir
inlet, insulation may be added here, or if the inlet fitting is a
typical 90 degree fitting, it may be changed to a straight or
45 degree fitting. Shorter discharge line lengths or insulation
may be required in cold climates.
While not all compressors and charging systems are
equipped with a discharge line safety valve this component
is recommended. The discharge line safety valve is installed
in the cylinder head or close to the compressor discharge
port and protects against over pressurizing the compressor
in the event of a discharge line freezeup.
DISCHARGE LINE TEMPERATURE
When the temperature of the compressed air that enters
the air dryer is within the normal range, the air dryer can
remove most of the charging system oil. If the temperature
of the compressed air is above the normal range, oil as oil-
vapor is able to pass through the air dryer and into the air
system. Larger diameter discharge lines and/or longer
discharge line lengths can help reduce the temperature.
The air dryer contains a filter that collects oil droplets, and a
desiccant bed that removes almost all of the remaining water
vapor. The compressed air is then passed to the air brake
service (supply) reservoir. The oil droplets and the water
collected are automatically purged when the governor
reaches its "cut-out" setting.
For vehicles with accessories that are sensitive to small
amounts of oil, we recommend installation of a Bendix
®
PuraGuard ® QC ™ oil coalescing filter, designed to minimize
the amount of oil present.
LUBRICATION
All BX-2150 ™ compressors are connected to the engine’s
pressurized oil system and a continuous flow of oil is provided
to the compressor, which is eventually returned to the engine.
Oil is fed into the compressor in various ways, for example;
through the rear end cover or the drive end of the crankshaft.
An oil passage in the crankshaft conducts pressurized oil
to the precision sleeve main bearings and to the connecting
rod bearing.
FIGURE 4A - SYSTEM DRAWING
Air Dryer
Reservoir Drain
Service Reservoir
(Supply Reservoir)
Compressor
Governor
(Governor plus Synchro valve
for the Bendix ® DuraFlo ™ 596
Compressor)
Discharge
Line Optional “Ping” Tank
Optional Bendix ® PuraGuard ® QC ™
Oil Coalescing Filter
The Air Brake Charging System supplies the
compressed air for the braking system as well as other air
accessories for the vehicle. The system usually consists
of an air compressor, governor, discharge line, air dryer,
and service reservoir.
FIGURE 4B - DISCHARGE LINE SAFETY VALVE
HOLE
THREAD