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www.bendix.com 1-800-AIR-BRAKE (1-800-247-2725)
Section 2: The Charging System
Governor
Air Dryer
Primary
Reservoir
Safety Valve
Air Compressor
Supply
Reservoir
Secondary
Reservoir
Check Valve
Check Valve
Safety
Valve
Low Pressure Indicator
Purge
Valve
Drain Valve
• Safety valves to protect against excessive pressure
in the system in the event that a charging system
component malfunction occurs, e.g. a line blockage
• Single check valves to maintain a one-way flow
of air into the reservoirs. This arrangement protects
the contents from being drained in the event of an
upstream loss of pressure
• Low pressure indicators to alert the driver
whenever a reservoir has less than a pre-set amount
of air available
The charging system consists of:
• An air compressor
•A governor, to control when the compressor
needs to build, or stop building, air for the system
and also to control the air dryer purge cycle
• An air dryer, to remove water and oil droplets
from the air
• Reservoirs (or “air tanks”) to store air to be used
for vehicle braking, etc.
Overview
The brake system needs a supply of compressed air
between a preset maximum and minimum. The
governor (along with a synchro valve for the Bendix
®
DuraFlo
™
596 air compressor) monitors the air
pressure in the supply reservoir and controls when
the compressor needs to pump air into the air system
(also known as the “air build cycle” - the compressor
is “running loaded”) and when the compressor should
simply turn over without building pressure (“running
unloaded”). When the air pressure becomes greater
than that of the preset “cut-out”, the governor controls
the unloader mechanism of the compressor to stop
the compressor from building air and also causes the
air dryer to purge. As the service reservoir air pressure
Bendix Air Compressors
The air compressor is the source of energy for the air
brake system.
Usually driven by the vehicle engine, the air compressor
builds the air pressure for the air brake system. The air
compressor is typically cooled by the engine coolant
system and lubricated by the engine oil supply. (Certain
models have self-lubricated and/or air-cooled versions
available.) Note: Air compressor shafts can rotate in
either direction.
The vehicle’s compressor draws in filtered air, either
at atmospheric pressure from the outside (or already
at an increased pressure, from the engine turbocharger
where permitted), and compresses it.
Note: Although a typical
three-reservoir system is
shown here, some system
designs do not use a
Supply reservoir.
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