SKU 94274 For technical questions, please call 1-800-444-3353 PAGE 18
Maintaining Suction Efciency:
The most common problem operators have when using a suction (venturi) Blast 1.
Cabinet is a decrease in production rates. When production rates fall the opera-
tor can usually locate the problem by checking the following:
Air supply. 2. If the Pressure Gauge (8) on the Air Regulator (9) shows an adequate
no-load supply (when the Blast Gun (4B) is not running), press the Foot Pedal
(11). If the pressure drops more than a few PSI the air supply is restricted or
inadequate. Clean lters and moisture separators all the way back to the air
compressor. Straighten any kinked hoses. Use a master gauge (not included) to
check the air pressure, or replace the existing Pressure Gauge if you suspect it is
giving you false readings.
Blast Gun. 3. The Nozzle (2D, 2E) will wear out eventually. Replace the Nozzle if its
opening measures 1/16” over its original size or if it shows uneven wear. Adjust as
needed for different media and conditions. A properly working Blast Gun (4B) will
pull 15 to 17 inches of mercury on a manometer. (See Assy. Diagram.)
Media. 4. Use quality blast media sized to the job. Damp or dirty media can bring
blasting to an instant halt. Store media in a dry area and load the appropriate
quantity (up to 15 pounds). Add enough media through the Grate (39) within the
Cabinet (22) to have 6 inches deep of media on top of the Metering Valve (13).
If you run out of media as you are blasting, add enough so it keeps circulating to
the Blast Gun (4B). The media will eventually break down or get too contaminated
to use. The less there is in the system, the less you will have to replace.
Media delivery. 5. Replace any media hose that has soft spots or visible wear.
Adjust the Metering Valve (13) to provide adequate ow. A mixture that is too
rich will cause pulsating at the Blast Gun (4B). An unusually loud noise while
blasting means the mixture is too lean. A rich mixture can result in lower impact
velocities, while a lean mixture reduces the number of impacts.
REV 08a