Metering unit for controlling volume of fuel supplied to high pressure pump i.e. radial piston pump, of common-rail system of diesel engine, has one-way valve integrated into bearing and opening towards cover element or armature space

摘要

The metering unit (6) has a magnetic valve i.e. proportional valve, with an armature-plunger unit whose upper section (31) is inserted into a bearing (13) and partially arranged in a cover element (16). A one-way valve (24) is integrated into the bearing and opens in a direction towards the cover element or an armature space (25). The valve is constructed by a resilient washer (28) and a hole (27) i.e. through hole, formed in the bearing. The resilient washer is connected between the bearing and a housing portion (29) of the magnetic valve or between the bearing and the cover element.