| 摘要 |
The invention relates to a device (2) for the metered injection of a liquid processing agent for exhaust gases, preferably an aqueous urea solution, into an exhaust system of an internal combustion engine, with at least one fixture body (5) having a working chamber (6), and at least one volume compensating element (23) which adapts the capacity of the working space (6) to correspond to the change in volume of the liquid processing agent for exhaust gases during the phase transition thereof. The material of the volume compensation element (23) has a temperature-dependent coefficient of expansion such that the change in volume, caused by the volume compensation element (23), reacts to the change in volume of the liquid processing agent for exhaust gases during the phase transition of the latter. |
