Dosing system for introducing urea-water-solution into exhaust gas apparatus of internal combustion engine, has directional valve comprising housing, adjusting unit and actuator, and throttle or diaphragm integrated into valve

摘要

The system (10) has a tank (12), a dosing pump (16) and a directional valve (15) comprising connections (A1-A5). The directional valve has a housing, an adjusting unit and an actuator. A controllable throttle or diaphragm is integrated into the directional valve. The connections are hydraulically connected with one another by the directional valve in an end position of the adjusting unit. A locking unit operated by the adjusting unit is arranged in an annular area, and the dosing pump is arranged between the tank and a dosing module. A linear actuator is arranged in one of the connections.