Pump-jet device for diesel engine fuel injection with pump, control valve and jet unit has throttle between working space of pump and discharge channel coupled to control space via valve element

摘要

The pump-jet device has a pump with a reciprocating piston (11), a control valve with a valve element (231) providing a hydraulic coupling between a control space (232) and a discharge channel (22), hydraulically coupled to the working space (13) of the pump via a throttle (18) and a jet unit. The throttle has a maximum hydraulic cross-section which is 25 % greater than the hydraulic cross-sectional surface of the open valve.