INJECTOR AND SYSTEM FOR DOSING REDUCING AGENT

摘要

The invention relates to a device for metering reducing agent and to an injector in a device for metering reducing agent. The device injects reducing agent, in particular an aqueous urea solution, which can be discharged into an exhaust tract of an internal combustion engine, in particular of a diesel internal combustion engine, by means of an injector (1) to which the reducing agent can be supplied from a storage tank via an inflow line (5) by means of a metering pump and which can be recirculated by means of a recirculation line (6) into the storage tank, wherein the injector (1) is attached by means of a nozzle holder (2) to an exhaust pipe (7) of the exhaust tract and a spring-loaded injection nozzle (4) of the injector (1) can open automatically as a result of the pressure of the reducing agent, into the exhaust tract, wherein the injection nozzle (4) is connected to the nozzle holder (2) by means of a nozzle extension (3) and, an inflow duct (14) and a return duct (15), which run parallel to one another, are provided in the nozzle extension (3).