Patent ID: 8171722

Claim:
A fluid delivery system for supplying fluid to an exhaust stream of a power source, comprising: a supply tank configured to store reductant; an annular supply manifold configured to be located in an exhaust system and receive reductant supplied by the supply tank, the annular supply manifold including a circumferential passageway and configured to supply the reductant to an exhaust stream of a power source; and a plurality of supply exit orifices fluidly linked to the circumferential passageway to allow the reductant to exit the annular supply manifold to the exhaust stream, wherein the annular supply manifold further includes: an inlet to the circumferential passageway configured to receive the reductant from the supply tank, an outlet to the circumferential passageway configured to direct the reductant from the annular supply manifold back to the supply tank, and an internal wall in the circumferential passageway separating the inlet from the outlet such that the reductant is configured to flow unidirectionally from the inlet, around the circumferential passageway, and to the outlet.