Modern diesel engine require highly efficient fuel filter system. In general, in commercial vehicle, a filter is installed before and after the low-pressure pump. Hengst has dealt intensively with the subject of developing the pre- and main filtration as one calibration overall system. Compared to conventionally designed filters these calibrated system provide significant performance advantages.
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There are few areas in which vehicle filtration has become significantly more complex in the past two decades than in diesel fuel filtration.
The drivers of these requirements were, and are, the impressive technological optimisations of the injection systems. With the objective of increasing efficiency and minimising emissions, components and systems are being further refined and pushed to their technical limits. On the other side, their sensitivity to contamination increases. The system manufacturers are therefore forced to require high fuel purity levels when it enters the injection systems.
In addition, engines in use throughout the world come into contact with highly divergent fuel qualities which are also contaminated, to varying degrees, with particles and water. For many regions in the world, nearly unsustainable upper thresholds for the contamination of the provided fuels can be indicated. The same applies to contamination from solid particles which might come, for instance, from corrosion or wear and tear on upstream fuel provision systems. To a comparable degree, water contaminates the fuels.
Conclusion: The purity requirements for fuel prior to entering the injection system increase while increasingly critical assumptions, with respect to the fuel quality on the raw side, have to be made.
REQUIREMENTS FOR PARTICLE FILTRATION AND WATER SEPARATION
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