BENDIX SD-08-2417 Manuale Utente

AIR DRYER OPERATION: 

GENERAL
The  Bendix

®

 AD-IS

®

 EverFlow

®

 assembly alternates 

between the dryers each time the brake system charges. 

During high air demand, the dryers alternate every 30 

seconds  to  allow  drying  of  the  added  volume  of  air. A 

pressure protection valve is needed after the dryers to 

maintain at least 70 PSIG at the dryers during high air 

demand. A Bendix

®

 EverFlow

® 

electronic module monitors 

the air brake system and determines the amount of 

demand.    The AD-IS  EverFlow  assembly  requires  a 

signal from the delivery port of the governor into the 

GOV port of the EverFlow

 

electronic module.  The AD-IS

 

EverFlow assembly also needs a supply air line from the 

secondary tank to the electronic module RES port. 

The AD-IS EverFlow assembly is primarily designed to dry 

air on systems used for bulk unload and central tire inflation. 

The system operates best when a pressure protection valve 

is installed between the EverFlow assembly and the source 

of the high volume air. Refer to the system schematics, 

Figure 2.  This pressure protection valve should have a 

minimum  pressure  of  70  PSIG. 

When the compressor is charging (compressing air) air 

flows through the compressor discharge line to the inlet 

(1 IN) port of one of the air dryers. The compressed air 

includes contaminates such as oil, oil vapor, water and 

water vapor. The air then flows into the desiccant cartridge, 

where  it  flows  through  a  liquid  separator  which  collects 

liquids and other contaminants.

COMPRESSOR

GOVERNOR

DESICCANT 

BED

DELIVERY 

CHECK VALVE 

(OPEN)

PRIMARY

PORT (PRI)

PURGE VALVE

(CLOSED)

TURBO 

CUT-OFF 

VALVE

(OPEN)

ENGINE 

TURBO

UNLOADER 

PORT 

SUPPLY 

PORT

PRIMARY

RESERVOIR

PRESSURE 

PROTECTION 

VALVES

AUXILIARY PORTS

(TO ACCESSORIES)

SEE

NOTE 1

The Bendix

®

 AD-IS

® 

air dryer and reservoir 

system purge piston has a purge control 

channel drain. This allows any condensation 

in this area to flow past a diaphragm in the 

top of the purge piston and out through a 

channel in the middle of the central bolt of 

the purge assembly to be drained. During 

the purge cycle this drain is closed.

SAFETY

VALVE

PURGE 

RESERVOIR 

DRAIN VALVE

SECONDARY

RESERVOIR

SECONDARY

PORT (SEC)

PURGE 

RESERVOIR

PURGE 

ORIFICE

OIL COALESCING FILTER 

(BENDIX

®

 AD-IS

®

 PURAGUARD

®

 

OIL COALESCING AIR DRYER)

A

D

C

B

PURGE 

CONTROL 

CHANNEL