AEC Continuous Vacuum/Pressure Conveying Systems - Manual (Page 30)

Single- and Dual-Blower Continuous Vacuum/Pressure Systems Page 29
IMPORTANT! The power unit is sized for the total conveying distance.
In some cases, if the takeoff on the railcar does not have an
adjustment to restrict material flow into the vacuum side
material line, too much material may be drawn on the vacuum
side.
A solution for this condition is to install a manual valve
on a T in the material line as close to the take-off as possible.
Throttle this valve to supply some of the air requirement
of the vacuum unit to prevent excess material from plugging
the line.
4-3-6 Installing the Filter Chamber
Used in Combination with the Cyclone Separator Only
The filter chamber protects the vacuum blower from damage caused by
material carryover from the cyclone separator. Primary system filtration
occurs in the cyclone separator and any fines that are carried over to the
filter chamber are trapped in the cartridge filter in the filter chamber.
A vortex created in the filter chamber separates carryover from the air
stream, and a cartridge filter catches any dust and any fines into the upper
chamber. If used in a very dusty application the filters can be cleaned in
any one of the following ways:
• Install an atmospheric vent valve on the outlet of the filter chamber.
During the blowback cycle, when the valve is energized,
atmospheric air is introduced to the filter chamber, equalizing the
pressure inside the filter chamber with a rush of air across the filter.
• A compressed air filter cleaning blowback option is used for very
dusty applications, and cleans better than the option listed above.
1. Level and secure the filter chamber near the pump package. Use three
eighths-inch ( 3 /
8
”) bolts to anchor the filter chamber.
2. Connect the piping between the vacuum inlet valve on the pump and
the outlet tube on the cover of the filter chamber. For easy filter
maintenance, use at least three (3) feet (1 m) of vinyl flex hose at the
end of the run to the filter chamber. The rest can be hard-piped as long
as it is properly supported.
3. If the filter chamber has the optional atmospheric valve, insert a short
piece of chamfered tubing into the valve body inlet, tighten the set
screws, and connect the flex hose to the tube with a clamp.