Injection valve arrangement

摘要

An injection valve arrangement for injecting a pressure medium into a combustion chamber of a cylinder in an internal combustion engine, whereby the pressure medium is an additional medium by means of which the contents of noxious substances resulting from combustion of the fuel can be decreased. The arrangement comprises a valve body part (2) including a first chamber (4), into which the additional medium is continuously fed through a feed duct (8,8a), and an elongate valve member (6) for an injection valve (3) which controls the feeding of the additional medium from the first chamber (4) into the combustion chamber of the cylinder and which is spring-loaded (7) towards a closing position in which the injection of the additional medium is prevented. The arrangement further includes a second chamber (12), into which the additional medium is arranged to be fed and in which the pressure prevailing therein presses the valve member (6) towards its closing position, and a control valve (15) associated with said second chamber (12) and arranged to control the pressure in the second chamber (12) so that the movement of the control valve (15) to an open position causes the pressure to fall in the second chamber (12) so that the valve member (6) moves into a position allowing injection.