A PF pump or unit pump with a mechanical nozzle holder assembly is used for each engine cylinder to inject the fuel. The robust design allows operation of the nozzle holder with a large selection of fuel types.
of injection pressure for efficient combustion
of reliable operation due to robust design
Drag to rotate
The nozzle holder assembly is selected to match the delivery rate, spray form and injection pressure. In the single-cylinder pump system, the nozzle holder assembly can be adapted to different engine sizes and outputs.
Feed
Retaining element
Nozzle clamping nut
Shim washer
Injection nozzle
Rod filter
Fuel leakage connection
Pressure setting discs
Pressure channel
Compression spring
Pressure bolt
Fixing pins
Union nut with pressure line
The nozzle-and-holder assembly is made up of nozzle holder and nozzle. The compression spring inside the nozzle holder acts on the nozzle needle via the pressure pin. During the injection process, the nozzle needle is lifted upwards by the pressure of the fuel. The fuel passes through the injection orifices into the combustion chamber.
The injection process comes to an end when the fuel pressure drops to a point where the compression spring is able to push the nozzle needle back against its seat. Start of injection is thus controlled by fuel pressure. The injected fuel quantity depends essentially on how long the nozzle remains open.
Max. system pressure
Lifespan
Engine output per cylinder
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