®
Bendix® PuraGuard® System Filter
DESCRIPTION
The PuraGuard ® system filter is used to assist the production of purified compressed air on high air use vehicles.
The PuraGuard® system filter consists of a filter element mounted in a die cast aluminum housing. The sump housing contains a drain valve for maintenance. For ease of serviceability, all maintenance kits do not require removal of the PuraGuard® system filter from its mounting on the vehicle.
ONE SUPPLY & ONE DELIVERY PORT | |
(SEE ARROW SYMBOL ON PURAGUARD® | |
SYSTEM FILTER TOP COVER FOR AIR FLOW) | |
MOUNTING |
|
BRACKET |
|
(2) |
|
| PURAGUARD® |
| SYSTEM FILTER |
| HEAD |
SUMP |
|
HOUSING |
|
| DRAIN VALVE |
EXTERIOR |
|
VIEW |
|
TOP |
|
VIEW |
|
SUPPLY | DELIVERY |
PORT | PORT |
FIGURE 1 - PURAGUARD® SYSTEM FILTER
SD-08-187
High air use vehicles (e.g. transit vehicles) may require the air compressor to exceed its normal duty cycle. The resulting high compressor discharge temperatures can allow oil aerosols to pass through the air dryer, condensing downstream in air system components.
The PuraGuard® system filter follows the air dryer in the system and removes approximately 99% of oil aerosols. On vehicles not using an air dryer, the PuraGuard® system filter follows the supply (“wet tank”) reservoir (see Figures 3 & 4).
OPERATION
GENERAL (See Figure 2)
Compressed air passes through the supply port of the PuraGuard® system filter and travels downward through the center of the filter element. As the air passes through the filter material, oil in liquid and aerosol form are removed and collected in the sump. The air travels back up from the sump, through the PuraGuard® system filter delivery port and into the air system.
DELIVERY
PORT
SUPPLY
PORT
FILTER | |
| ELEMENT |
| HAS |
| |
| INCLUDED |
FILTER | SPRING |
ELEMENT |
|
SPRING 
LOCATOR
DRAIN
PORT
FIGURE 2 - CUT-AWAY SHOWING AIR FLOW
1