Bendix Commercial Vehicle Systems PURAGUARD SYSTEM FILTER 7/04 - Manual

1
®
SD-08-187
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.
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.
FIGURE 2 - CUT-AWAY SHOWING AIR FLOW
SPRING
FILTER
ELEMENT
HAS
O-RING
INCLUDED
DELIVERY
PORT
FILTER
ELEMENT
O-RING
SUPPLY
PORT
SPRING
LOCATOR
DRAIN
PORT
FIGURE 1 - PURAGUARD ® SYSTEM FILTER
DELIVERY
PORT
SUPPLY
PORT
TOP
VIEW
ONE SUPPLY & ONE DELIVERY PORT
(SEE ARROW SYMBOL ON PURAGUARD ®
SYSTEM FILTER TOP COVER FOR AIR FLOW)
DRAIN VALVE
MOUNTING
BRACKET
(2)
PURAGUARD ®
SYSTEM FILTER
HEAD
SUMP
HOUSING
EXTERIOR
VIEW