Vacuum filter / Negative-pressure filter

Suction belt filter SAFI-E (fleece filter)

The POLO suction belt filters, SAFI-E series are used for applications up to max. 3000 litres per minute. They are used as stand-alone filters or to supply machine groups. This high-performance system cleans liquids fully automatically, especially emulsions and oils from metal processing.

Their advantages

  • Vacuum filter for medium volume flows
  • Correct separation of dirty/clean side
  • Wide range of filter fleeces
  • Dry filter cake

Short info

  • Compressed dirt cake, dry, stab-proof
  • 10 different sizes
  • Energy-optimised by FU control
  • Precise lateral seals

Increased volume throughput

The POLO SAFI-E suction belt filter is equipped with an exhauster that creates a negative pressure in the filter cleaning chamber. The flow rate is significantly increased, the filter cake builds up higher and serves as an additional “filter layer”. The degree of purity of the filtration is increased. The filter can be adapted to any new task by easily and quickly changing the fleece.


The filter housing consists of a high-quality welded steel or stainless steel construction. A transport chain carries the filter fleece through the filter bed. An exhauster generates the negative pressure in the vacuum chamber and thus significantly increases the flow rate per square feet (square metre) of filter surface. The cleaned cooling lubricant enters the clean chamber from where it is discharged into the clean tank by means of a pump. The functions, triggered by float switches, are controlled by a control box.


The medium is calmed and fed to the filter by the inlet distributor, flows through the filter medium and reaches the vacuum chamber (clean chamber) cleaned. The filter discharge pump sucks the medium out of the vacuum chamber and conveys it into the clean tank.

The exhauster creates a negative pressure in the vacuum chamber. This negative pressure supports the flow rate considerably and results in a better utilisation of the filter medium due to a higher dirt cake build-up. The built-up filter cake provides an additional, high-quality filter layer and thus improves the degree of filtration.

As the filter aid becomes increasingly dirty, the liquid level on the dirty side of the filter rises. The fleece pre-stroke occurs at a preset liquid level. The filter cake discharged with the fleece is dried additionally by the exhaust air of the exhauster. The filtration process is not interrupted during the fleece pre-stroke. An additional buffer tank for intermediate storage of the dirty cooling lubricant is not necessary!

not necessary!
The built-up filter cake is a valuable filter aid and significantly improves the degree of purity. Due to the short stroke steps, this “precoat medium” is almost completely preserved and the degree of purity remains unchanged.

Precise sealing

Compact design

Lightweight fleece usable

Made in Germany

Variety of materials

Process safety

Picture gallery

Data sheet

Standard sizesSAFI-E0.8SAFI-E1.3SAFI-E1.5SAFI-E1.7SAFI-E2.1SAFI-E2.5SAFI-E3.1SAFI-E3.6SAFI-E4.1
Mounting dimesion L x W1250 x 11401750 x 11402000 x 11402250 x 11402750 x 11403250 x 11403850 x 11404500 x 11405000 x 1140
Height 150015001500150015001750175017501750
Weight approx. (kg)104011651235129014151620176019252040
Volume approx. (litres) 34561575089011601435176021152385
Flow rate max. (l/min) emulsions*5009301100125015501850230026753050

*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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