| 摘要 |
<p>The invention relates to a dosing pump assembly which is used to mix a liquid reducing agent to an exhaust gas flow, which comprises a pre-mixing device (39) wherein the introduced reducing agent is mixed with the compressed gas in a mixing area (18). Said unit is characterised in that a first non-return valve (20) is arranged in the pre-mixing element (39) in a supply line (15) for the reducing agent in the direction of flow in front of the mixing area (18).</p> |
