MANN+HUMMEL has developed a solution for removing small and finely distributed water droplets from diesel fuel.
Fuel flows through the MANN-FILTER PU 12 004 z diesel fuel filter from the outside to the inside in three stages.
This is referred to as pressure-side filter operation.
In the first stage, the filter medium reliably removes solid dirt particles from the diesel fuel.
The second filter stage uses a coalescer fleece, retaining even the finest water droplets from the fuel/water emulsion and combines them to form much larger drops.
In the third stage, a hydrophobic sieve ensures that the enlarged drops do not enter the injection system.
Gravity causes the separated water to collect in a water collection chamber in the filter module.
A sensor signals as soon as the water needs to be manually drained or siphoned.
A MANN+HUMMEL spokesperson said: “The MANN-FILTER PU 12 004 z separates over 90 per cent of water droplets from current gas station diesel fuels, even in the case of tiny water droplets of up to ten micrometers.
“It works right up to the end of the service interval, even with a loaded filter element.
“Both single-stage and two-stage concepts on the market achieve relatively low separation efficiency of up to a maximum of 35 to 40 per cent and therefore do not provide reliable protection for modern injection systems.”
In conjunction with the PU 5003 prefilter, which protects the low-pressure pump, it will be available as the PU 12 010-2 z set for the Mercedes-Benz Actros, heavy-duty engine platform HDEP.
Metal-free elements mean that both filters are completely incinerable and therefore can be recycled to protect the environment.
the spokesperson added: “A PreLine prefilter is currently in planning for regions whose fuel quality is affected by high particle and water contamination.
“This is mounted on the intake side, also operates with three-stage water separation and ensures optimal protection of the engine.
When the mechanic turns the cover during removal of the filter, the retaining bracket of the element end plate connect firmly with their mating parts in the cover.
When unscrewing, this bayonet bracket ensures that the entire filter element releases and lifts up from the connection in the housing without the usual force.
The company has obtained patents in a number of countries for the filter element with bayonet bracket.
Martin Veit, lead product engineer for fuel filter development at MANN+HUMMEL’s automotive aftermarket business unit said: “Whether corrosion or cavitation effects in injectors, valves, or the CR-system high-pressure pump, this innovative separation technology greatly reduces damage that can result in system failure.”
MANN+HUMMEL has filed several patents for the new filter technology with the German Patent and Trademark Office as well as in other countries.
For further information about MANN-FILTER, select ‘more details’ below.