Maintaining Suction Efficiency:
1.The most common problem operators have when using a suction (venturi) Blast Cabinet is a decrease in production rates. When production rates fall the opera- tor can usually locate the problem by checking the following:
2.Air supply. If the Pressure Gauge (8) on the Air Regulator (9) shows an adequate
3.Blast Gun. 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.)
4.Media. 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.
5.Media delivery. Replace any media hose that has soft spots or visible wear.
Adjust the Metering Valve (13) to provide adequate flow. 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
SKU 94274 | For technical questions, please call | PAGE 18 |