Справочник Пользователя для BENDIX SD-08-2433

COMPRESSOR

GOVERNOR

DESICCANT 

BED

DELIVERY 

CHECK 

VALVE

PURGE 

VALVE

CONTROL 

PORT 

SUPPLY 

PORT

FRONT

RESERVOIR

The Bendix

®

 AD-9si

™ 

air dryer 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

REAR

RESERVOIR

PURGE 

ORIFICE

OIL 

COALESCING 

FILTER

CONTROL 

LINE

PURGE AIR

EXTENDED

PURGE

PORT

EXHAUST

EXHAUST

DELIVERY 

PORT

When the compressor is running loaded (compressing air), 

compressed air flows through the compressor discharge 

line to the inlet (IN 1) port of the air dryer body.  The 

compressed air often includes contaminates such as oil, 

oil vapor, water and water vapor.
Traveling through the discharge line and into the air dryer, 

the temperature of the compressed air falls, causing 

some of the contaminants to condense and drop to the 

bottom of the air dryer and purge valve assembly.  These 

contaminants are ready to be expelled at the next purge 

cycle.  The air then flows through the inlet tube and 

into  the  desiccant  cartridge,  where  it  flows  through  an 

oil  separator  —  or  coalescing  filter  if  equipped  with  a 

Bendix

®

 PuraGuard

®

 oil coalescing cartridge — which 

removes water in liquid form as well as liquid oil and solid 

contaminants.

Air then flows into the desiccant drying bed and becomes 

progressively more dry as water vapor adheres to the 

desiccant material in a process known as adsorption.
Dry air exits the desiccant cartridge, through the outlet tube, 

then flows to the delivery check valve.  Some air exiting 

the desiccant cartridge is diverted through the orifice into 

the purge volume area.  The delivery check valve opens, 

supplying air to the two delivery ports.  The purge reservoir 

fills, storing air that will be used to regenerate the desiccant 

during the purge cycle.
The air dryer will remain in the charge cycle until the air 

brake system pressure builds to the governor cut-out 

setting of approximately 130 psi.

TURBO 

CUT-OFF 

VALVE 

(OPEN)