Patent ID: 9422850
Filing Date: 2016-08-23
CPC Classification: F01N,F04B,F16K,Y02T,Y10T

Claim Text:
1. An apparatus for urea dosing of an exhaust aftertreatment system, the apparatus comprising: a urea solution source; a chamber configured to receive pressurized gas from a gas outlet, receive urea solution from the urea solution source via a urea outlet, and provide a combined flow of pressurized gas and urea solution; a gas passage extending from the gas outlet to a seating surface; and a valve member configured to move between an open position in which the valve member is spaced apart from the seating surface and a closed position in which the valve member contacts the seating surface; wherein as the valve member moves from the open position to the closed position the valve member contacts the seating surface at a first location and wipes an area of the seating surface extending from the first location in a direction toward the gas passage.