| 摘要 |
<p>The pump unit has a dosing pump (2) designed as a membrane pump and sucking a reduction medium e.g. urea, via a suction pipe, where the medium is stored in a tank (4). A pre-mixing unit includes a mixing region (18) in which the reduction medium and pressurized exhaust gas are mixed. A check valve (6) is arranged before the mixing region in a supply line for the reduction medium in the flow direction.</p> |
