A suction feed system uses a venturi siphoning action to draw the blast media from a hopper into the compressed air stream within the gun nozzle itself. The air and media pass through the nozzle, to be directed at the component.
A pressure feed system stores the blast media within a pressure pot. When the pot is sealed, the blast media falls through a valve into a compressed air stream within the blast hose. It is then accelerated through the blast nozzle to impact upon the component.
The pressure feed system produces faster moving blast media and offers cycle times that can be up to 4 times faster than a suction feed system.
Both methods can use a very wide selection of blast media. By additionally varying the media particle size and the blast pressure used, these two systems can offer a range of finishing from light, delicate work to high production, demanding and aggressive applications.
Our Manual Blast Equipment Guidelines brochure covers this and many other topics. Download the Blast Equipment Guidelines brochure here, or call 01756 799911 and ask Customer Service to send you a copy.