FAUDI gravity belt filter for the filtration of washing water

Gravity belt filters

Filtration technology for cleaning of liquids.

Gravity belt filter in stainless steel on white background
Belt filter_gravity belt filter type AFB EST

Belt filters

Gravity belt filters (AFB)

Automatic gravity belt filters are wide applicable and used for the cleaning of liquids. They are excellent for separating solids from low-viscosity liquids. This means that the cleaned liquids can be used for longer periods of time, which has a positive effect on the environment and operating costs. Depending on the area of application, FAUDI gravity belt filters are available in steel or stainless steel. In the mineral, mining and metalworking industries, e.g. grinding, turning, milling, the steel version of the gravity belt filter is very widespread. The stainless steel version of the gravity belt filter, on the other hand, is used in the chemical industry for the filtration of e.g. plastic granulate, in the pharmaceutical industry, the food industry and environmental technology (e.g. wastewater) or also for the use of deionised water or in degreasing and depainting bathes. Gravity belt filters are especially suited for close quarters or for supplying individual machines. Of course, they can also be delivered as complete and fully automatic filtration systems. The filtration capacity depends on the filter size and the filter medium. It can range from 30 l/min to 1,500 l/min.

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your advantages
at a glance

  • The vast range of options allows special customer requirements to be met flexibly. For example, FAUDI belt filters can be installed on top of existing tanks and are offered as a complete system with tanks, pumps, heating, cooling and control system – conventional or with PLC.

FAUDI gravity belt filter for the separation of solids from low-viscosity liquids
Design layout FAUDI gravity belt filter

Design layout

Gravity belt filters (AFB)

The gravity belt filter consists of the following components:

1. Nonwoven
2. Nonwoven (roll)
3. Filter inlet
4. Float switch
5. Sludge box
6. Drive engine

FAUDI gravity belt filter for the separation of solids from low-viscosity liquids
FAUDI gravity belt filter_Rendering

How does
a gravity belt
filter work?

The automatic belt filter consists of a steel resp. stainless steel frame in which an endless wire mesh belt is led. This wire mesh belt is carried over a drive roller and a return roller with low wear and forms a deep filter trough together with the non-woven fabric. The contaminated liquid flows calmed over an inlet tray or an inlet box with guide plates into this filter trough. Due to the gravity the liquid flows through the non-woven fabric. During this process the non-woven fabric separates impurities and a filter cake is formed. This filter cake retains more and more fine impurities and reduces the discharge bit by bit. The liquid level in the filter trough rises until the float switch actuates the feed of the non-woven fabric. The contaminated non-woven fabric is fed forward and carried out into the sludge box. At the same time, clean non-woven fabric is pulled from the fabric roll and led into the filter trough, the liquid level falls and the feed of the fabric roll is stopped. The operation restarts. The cleaned liquid is available again for the process.

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Gravity belt filters (AFB-ST/AFB-EST)

Data and facts

  • Filtration fineness

    20 – 30 µm

  • Fluids

    Liquids in the chemical industry, aqueous media, oils and emulsions

  • Filter material

    Fibre non-woven

  • Filter surface area

    0.3 – 11.0 m²


where they are used


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