Belt filters / Gravity filters

Inclined bed filter SBN

The well-proven inclined bed filter has been re-engineered. The filter, which has many long-known advantages, such as high throughput volume due to the high hydrostatic pressure, has now become even better. All in all it offers better operability, more service-friendly accessibility and complete coverage. What has remained is the unique fleece guide.
Unlike conventional models, the fleece is not pulled but carried. The filtering process is safe and efficient.

Their advantages

  • Space-saving
  • Correct separation of dirty/clean side
  • Low fleece usage
  • Low energy consumption

Short info

  • Compact filter
  • Very good accessibility for servicing
  • Easy fleece and seal replacement

Wide range of fleece

thus optimised adaptation to the operating conditions. The inlet distributor prevents turbulence. A clean tank must be placed underneath the filter. The purified liquid is usually returned by a pump.

Less fleece required

The POLO inclined bed filter SBN operates with an endless transport chain that carries the filter fleece in a way that is gentle on the material. This anti-tear principle enables the use of extremely thin and thus inexpensive fleeces, which ensures maximum process reliability. It has a defined, precisely working side seal.


The POLO inclined bed filter SBN consists of a steel or stainless steel welded housing with drive and deflection shaft. It operates with an endless transport chain that carries the filter fleece in a way that is gentle on the material. An extremely deep filter trough is formed, resulting in a high liquid level. This decisively limits the consumption of fleece. The control functions, triggered by float switches, are carried out by an external or integrated electrical control box. The filtering process is safe and efficient.


The liquid is fed to the filter without pressure by means of the inlet distributor, flows through the fleece and, when cleaned, reaches a clean tank below through the outlet.

The shape of the filter bed allows a high liquid level. This increases the throughput and makes the best possible use of the fleece. The dirt particles are deposited on the fleece and reduce the flow more and more.

These dirt particles (filter cake) represent an additional, high-quality filter layer and thus improve the filter result. The level rises on the dirt side of the filter. At a preset level, there is a belt cycle (approx. 50 mm long).

The filter process is not interrupted during continued cycling, an additional buffer tank is not necessary! The built-up filter cake is a valuable filter aid and significantly improves the degree of purity.

Due to the short belt cycles, only a very small part of the filter surface is renewed, so that the essential part of the liquid flows through this “flushing medium” and thus increases the filter fineness.

A hose seal, resistant to all commercially available cooling lubricants, reliably isolates the dirt chamber from the clean side.

A fleece shortage switch (option) gives a signal that the fleece roll needs to be replaced.


Energy efficiency

Compact design

Made in Germany

Process safety

Picture gallery

Data sheet

Standard sizesSBN-A0.3SBN-A0.4SBN-A0.8SBN-K0.5SBN-B0.8SBN-B1.6
Mounting dimesion L x W810 x 5711100 x 5712100 x 5711100 x 7841100 x 10842100 x 1084
Lenght 130016002600160016002600
Weight approx. (kg) 110130260150220320
Volume approx. (litres) 4010025070200420
Flow rate max. (l/min) emulsions*170220400220440800
Flow rate max. (l/min) oils*85110200110220400
Connected load (kW) 0,120,120,180,120,180,37
Supply voltage 3~400V 50Hz3~400V 50Hz3~400V 50Hz3~400V 50Hz3~400V 50Hz3~400V 50Hz

*Definition of flow rate: Emulsions and aqueous media approx. 1 mm²/sec at 20 °C and oils up to 15 mm²/sec at 20 °C.
The maximum flow rate of the filter is indicated; depending on the machining process and the degree of contamination, the flow rate may be lower.

Subject to technical changes in the interest of progress.

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