Patent ID: 7100366

Claim:
An apparatus for posttreatment of exhaust gases of an internal combustion engine of the type employing a reducing agent to be introduced into the exhaust gases, in particular a urea or a urea-and-water solution, the apparatus comprises a mixing chamber, into which the reducing agent and compressed air are introduced via a reducing agent line and a compressed air line, respectively to create a reducing agent-air mixture, and a check valve operable to prevent a reverse flow of reducing agent or reducing agent-air mixture from the mixing chamber into the compressed air line, the check valve including a spring loaded elastomer sealing hose ( 110 ) which, upon subjection of the compressed air line to pressure, allows compressed air to pass from the compressed air line into a mixing space of the mixing chamber and when the subjection of pressure is in the opposite direction prevents reducing agent or reducing agent-air mixture from passing from the pressure chamber into the compressed air line.