Patent ID: 8359834

Claim:
An apparatus for injection of a fluid for an exhaust gases treatment device of an internal combustion engine arrangement, apparatus including: an electromagnetically controlled fluid injector fed from a source of fluid under pressure through a fluid conduit, and adapted to inject fluid in a flow of exhaust gases within an exhaust line of engine arrangement; a feed valve in the fluid conduit between source of fluid and injector for controlling the delivery of fluid; a purge system for purging the injector, the purge system comprising a gas conduit connecting a source of pressurized gas to the fluid conduit; the purge system further comprises: a pressure limiter within gas conduit; and a check valve downstream of pressure limiter for preventing backflow from the fluid conduit towards the gas source, wherein the pressure limited by pressure limiter is lower than the pressure of fluid delivered by the source of fluid in the fluid conduit downstream of the feed valve, and all valves of the purge system are passively controlled valves.