| 摘要 |
<p>An injection device (20) for administering a reagent into an exhaust chamber (28) of an internal combustion engine, comprising a device inlet (62) and a device outlet (30) and a sub-assembly held securely within a device housing (54). The sub-assembly comprises (i) valve housing (26) defining a valve seat (32), (ii) valve means (22, 38) movable outwardly from the valve housing (26), away from the valve seat (32), to permit the reagent to be delivered into the exhaust chamber (28) through the device outlet (30), whereby a force is applied to the valve means (22, 38) due to reagent delivered to the device inlet (62) which serves to urge the valve means away from the valve seat (32), and (iii) bias means (50) for applying a biasing force to the valve means (22, 38) which serves to urge the valve means (22, 38) against the valve seat (32) so as to prevent delivery of the reagent through the device outlet (30) into the exhaust chamber (28). The device housing (54) is a separate part from the valve housing (26) and has a housing bore (52) within which the valve housing (26) is held securely so as to hold the sub-assembly securely within the device housing (54).</p> |
