BENDIX SD-08-2417 사용자 설명서

COMPRESSOR

GOVERNOR

DESICCANT 

BED

DELIVERY 

CHECK VALVE 

(CLOSED)

PRIMARY

PORT (PRI)

PURGE VALVE

(OPEN)

TURBO 

CUT-OFF 

VALVE

(CLOSED)

ENGINE 

TURBO

UNLOADER 

PORT 

SUPPLY 

PORT

PRIMARY

RESERVOIR

PRESSURE 

PROTECTION 

VALVES

AUXILIARY PORTS

(TO ACCESSORIES)

EXHAUST

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

Air then moves into the desiccant drying bed and becomes 

progressively drier as water vapor adheres to the desiccant 

material in a process known as “ADSORPTION.”  Dry air 

exits the desiccant cartridge through the delivery check 

valve and also through an orifice into the purge reservoir. 

The delivery check valve opens, supplying air to pressurize 

the air brake system.  The purge reservoir stores air that will 

be used to reactivate the desiccant during the purge cycle. 
From a flat system — approximately 80 psi — the Bendix

®

 

AD-IS

®

 EverFlow

®

  electronic module is actuated and 

begins the purge cycle.  When the air pressure reaches 

the specified opening pressure — typically 106 psi — the 

pressure protection valves will open and air will be supplied 

to the primary reservoir, secondary reservoir or other 

accessories.  If the pressure protection valves are preset 

to different values, the valves will open in order of lowest 

setting  to  highest  setting  when  charging  a  flat  system.  

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  When air brake system 

pressure reaches the cut-out setting of the governor, 

the governor unloads the compressor and the electronic 

module sends a signal to one of the air dryers to purge.  

The governor unloads the compressor by allowing air 

pressure to fill the line leading to the compressor unloader 

mechanism — causing the delivery of compressed air to 

the Bendix

®

 AD-IS

®

 EverFlow

® 

assembly to be suspended.  

Similarly, the governor also supplies air pressure to the 

EverFlow

 

electronic module. The electronic module uses 

this signal to determine the volume of air in the brake 

system.  If  the  volume  is  normal,  the  electronic  module 

sends a signal to the control port on the proper dryer. If the