Three FAUDI vacuum filters in a row in a production hall

Vacuum filters

Filtration solutions for the treatment of coolant lubricants.


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Vacuum filter type FUF by FAUDI on white background
Vacuum filter type FUF_FAUDI

Belt filters: Vacuum filters (fuf)

Extend the service life of your cooling lubricants with FAUDI vacuum filters. Our vacuum filters (or vacuum belt filters) ensure optimum cooling and lubrication performance through efficent cleaning. Our vacuum belt filters also optimise your product quality and cost-benefit efficiency in other applications involving the cleaning of cutting, grinding and rolling oils, emulsions and aqueous solutions:

  • Separation ranges between 20 and 100 μm,
  • Filtration capacities from 100 l/min to 20.000 l/min,
  • customised to your application thanks to its modular design.

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Vacuum filter (FUF)


  • Filter fineness

    up to 20 µm

  • Fluids

    washing water, oils and processing emulsions

  • Filter material

    fibre fleece or endless belt

  • Filter area

    0,7 m² to 44 m²

Customised and efficient


High economic efficiency

With our vacuum filters, you can increase the cost-benefit efficiency of your production, for example by increasing the quality and service life of your cooling lubricants. The minimised operating and maintenance costs also contribute to the cost-effectiveness of our products.


High quality

Our vacuum belt filters fulfil strict quality standards. Thanks to the solid and innovative design of the inner workings, you get a very low-wear system. And we also place the highest demands on our service for you.


High level of customisability

We customise our vacuum filters for you. They are suitable for a wide range of filtration tasks. Thanks to the modular series and their combination, we can realise system capacities from 100 l/min up to >20,000 l/min.


Let us advise you now, non-binding, on the best configuration of our vacuum belt filters for your application.

FAUDI vacuum filters/vacuum belt filters are primarily used in the treatment of cooling lubricants.
Design layout FAUDI vacuum belt filter

Design layout

Vacuum filters (FUF)

Our vacuum filters are essentially made up of these components:

1. Filter inlet
2. Nonwoven
3. Nonwoven unwinding device
4. Wear strips
5. Wiper blades
6. Deflection shaft with sprocket
7. Compensation tank
8. Nonwoven rewinding device
9. Chain drive
10. Filter and supply pumps

The exact configuration of the vacuum belt filter depends on your individual requirements. We would be happy to advise you on the details.

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Vacuum filter as 3D animation on white background
Vacuum filter as 3D animation on white background

How do our vacuum
filters work?


The contaminated coolant lubricant is conveyed from the machine tool or machine tools via the connecting pipelines into the dirt tank of the vacuum filter. The dirt tank is the upper part of the vacuum filter and is seperated from the vacuum chamber by a perforated plate or slotted sieve layer on which the filter fleece, or endless belt is placed. By means of a filter and a supply pump, which is connected to the vacuum chamber and generates a corresponding vacuum, the contaminated cooling lubricant is sucked through the filter medium into the vacuum chamber and cleaned in the process At the same time, the filter and supply pump convey the previously cleaned coolant lubricant from the vacuum chamber back to the machine tool. Thereby a partial flow of the supply line is used to fill the compensation tank with cleaned coolant lubricant in order to ensure an uninterrupted supply line to the machine tools when regeneration is pending.

Cross section of a vacuum filter
Cross section of a vacuum filter


Depending on the machining process, regeneration of the filter is triggered when the preset negative pressure in the vacuum chamber or a preset filtration time is reached. By opening the butterfly valve in the bypass line between the equalisation tank and the vacuum chamber, clean cooling lubricant is fed from the equalisation tank into the vacuum chamber. This means that the supply of cleaned cooling lubricant is not interrupted even during regeneration. The contaminated fleece or endless belt, together with the filter cake, is carefully removed from the filter by scraper bars running around the filter. The design and construction of the vacuum filter ensures at all times that there is no relative movement between the filter medium and the rotating scraper bars that could damage the belt. The dirt is then separated from the filter medium at the discharge by scrapers and discharged from the system into containers provided by the customer. While the used fleece is wound up by the fleece winding device after the dirt has been scraped off, the endless belt is returned to the system.


We are your contact for engineering, pipework planning, monitoring and control.

Industries: where faudi vacuum belt filters are used

References: Projects with FAUDI vacuum filters


  • Three FAUDI vacuum filters in a row in a production hall
    FAUDI Vacuum filter type FUF
  • Three vacuum filters lined up in a row for installation
    FAUDI vacuum filter type FUF
  • A big vacuum filter in the open air, on which assembler works
    FAUDI_belt filter vacuum filter type FUF customized
  • Belt filter unit of the vacuum filter type in assembly
    Belt filter FAUDI vacuum filter type FUF assembling
  • Vacuum filter with filter fleece/nonwoven in a production hall
    Belt filter FAUDI vacuum filter type FUF
  • Vacuum filter system
    Belt filter_FAUDI_vacuum filter type FUF
  • Vacuum filter with electric cabinet
    FAUDI belt filter_vacuum filter type FUF

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