| 摘要 |
<p>The present invention pertains to a valve arrangement to control the flow of exhausts through an oxidation catalyst (4) in an exhaust conduit (2), which also comprises an SCR catalyst (6), which is arranged in a position downstream of the oxidation catalyst (4) with respect to the intended direction of flow of the exhausts in the exhaust conduit (2). The oxidation catalyst (4) is adapted to oxidise nitrogen monoxide NO in the exhausts into nitrogen dioxide N02. The valve arrangement comprises a bimetal component (15c, 16, 19, 20c) which changes shape as the temperature of the exhausts varies. The valve arrangement is adapted to control the exhaust flow through the oxidation catalyst (4), so that the oxidation catalyst's capacity to oxidise nitrogen monoxide (NO) into nitrogen dioxide (N02) is reduced when the bimetal component (15c, 16, 19, 20c) is in contact with exhausts having a temperature exceeding a predetermined value.</p> |
