For their customer MAN Truck & Bus, Hengst used the Blue.maxx modular system for diesel filtration as the basis for development of a custom solution: the Fuel Service Center (FSC). The “new” FSC is a five-stage filtration system with lifetime water separation, in which the single stages are optimally integrated in a pre-filter and main filter.
The special feature of this custom application is the mixing valve. At cold temperatures (during winter operation) warm diesel fuel from the return flow of the common rail system is mixed with cold diesel from the fuel tank. This prevents blockage of the filter insert by paraffin crystals. The system also ensures reliable operation during the transition period from summer to winter. This makes it possible to eliminate the electric heater in the pre-filter for normal use. The FSC will first be installed in MAN’s new D15 engine series.
The new D15 engine for TGS and TGX according to the Euro 6d standard comes with a compact nine liter displacement. Modern diesel engines put high requirements on the purity of diesel fuel. Differences in fuel qualities around the world necessitate efficient cleaning with modern fuel filtration concepts. That is why Hengst developed Blue.maxx – an innovative fuel filtration system in which the pre-filter and main filter are no longer considered separately. Instead, they form a well-coordinated overall system that combines single components on the basis of customer requirements. Up to five filtration stages achieve significantly better performance with respect to particle filtration, water separation and differential pressure combined with an optimal filter life, while also reducing the space needed for installation.