Patent ID: 7614222

Claim:
An exhaust treatment system, comprising: an exhaust treatment device disposed in-line; a flow switch disposed in-line, upstream of and in fluid communication with the exhaust treatment device, wherein the flow switch comprises a deflector having a diverging upstream portion for diverting, along an outer surface of the deflector, a fluid stream that contacts the upstream portion; a divider disposed downstream of the deflector having a hollow body that includes an upstream opening and a downstream opening, configured so as to provide a first potential flow path for the fluid stream that enters the body through the upstream opening and exits the body through the downstream opening, and a second potential flow path for the fluid stream that does not enter the body; and an aperture located in a downstream portion of the deflector upstream of the divider for allowing a flow of a displacing fluid therethrough such that the displacing fluid inhibits the diverted stream from converging to follow the first flow path, thereby directing at least a portion of the diverted stream to follow the second flow path; and a displacing fluid source in fluid communication with the aperture.