11
www.bendix.com 1-800-AIR-BRAKE (1-800-247-2725)
Reservoirs and Components
Reservoirs
are available
in many
configurations.
Reservoirs (or “air tanks”) serve the air brake system
as a storage tank for compressed air. The reservoir
size is selected by the vehicle manufacturer to provide
an adequate amount of air for use by the braking system
and other control devices.
Bendix reservoirs are built in accordance with SAE
specifications and are available in various sizes in both
single and double compartment design configurations,
and are certified to comply with government regulations
(such as FMVSS 121).
Reservoir draining devices are installed in air brake
reservoirs, and allow liquid contaminants collected to
be drained off. Vehicles without air dryers are normally
drained each day. Vehicles which have Bendix desiccant
air dryers should be drained every 30-90 days. [Tip:
The presence of water may indicate that the air dryer
cartridge may need to be replaced. Other potential
sources of water in the reservoirs are: when shop air
has been used to fill the system, an excessive duty cycle,
or excessive air leakage.]
Manual draining devices consist of drain cocks which
require manual operation at the point at which they
are installed. Drain cocks are available in various styles
and pipe thread sizes. [Tip: Always drain contents
slowly for best results.]
The Bendix
®
DV-2
™
automatic reservoir drain valve is
a completely automatic draining device. It is installed
directly into the end or bottom drain port of the
reservoir and does not require any additional control
lines. It is available in either an end-port or bottom-
port version, and with or without a (12v or 24v) heater.
These are most suitable for systems without a desiccant
air dryer.
Single Check Valves
The in-line single check valve allows air flow in one
direction only. Several sizes and configurations are
available to accommodate various piping arrangements.
Single check valves are used in air brake systems to
prevent loss of remaining system pressure if another
reservoir, or hose etc. upstream in the system fails.
For double check valves and pressure protection valves,
see page 14.
Low Pressure Indicators
Low pressure indicators are pressure-operated electro-
pneumatic switches that are designed to complete an
electrical circuit and actuate a warning light and buzzer
for the driver in the event air pressure in the service
brake system is below a minimum level for normal
operation. The low pressure indicator is available in
various pressure settings, is not adjustable, and is
generally used in conjunction with a dash mounted
warning lamp or warning buzzer or both.
Drain
Cock
SC-3
™
Single
Check
Valves
DV-2
™
Automatic Drain Valve
LP-2
™
Low
Pressure
Indicator
LP-3
™
Low
Pressure
Indicator
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