AF 74 S / AF 94 S

AUTOMATIC METAL EDGE FILTER
with radial scraper cleaning housing in welded design, optionally with cyclone effect

AF 74 S / AF 94 S

AUTOMATIC METAL EDGE FILTER
with radial scraper cleaning housing in welded design, optionally with cyclone effect

For the filtration and homogenization of low and high-viscosity fluids and pastes

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CASE STUDY

The compact inline filter systems can be equipped with automatic cleaning. The system is cleaned by rotating the cartridge against a spring actuated scraper. The AF 94 S version is with integrated preseparator.

Multiple advantages

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    Low costs

    Low life cycle costs because of no filter material consumtion

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    No interruption

    Cleaning is possible without interrupting filtration

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    Separation quality

    Precision separation using the surface filter principle

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    Filter cartridge

    Sturdy filter cartridge made of triangular stainless steel wire on a robust inner core

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    Efficient cleaning

    Efficient filter cleaning for process stability

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    Long service life

    Solid construction and high-quality materials for a long service life

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    Modular system

    Modular Vario system for optimal filter selection

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    Filter selection

    Modular Filtration Group Vario system for optimum filter selection

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    Wide range of applications

    Material variants for a wide range of possible applications

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    Service-friendly

    Service-friendly

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    Distribution

    Worldwide distribution

Operating principle

The Filtration Group metal-edge filter system is used for filtering and homogenizing an extensive range of liquids and pastes. The compact, inline filter system does not consume any filter material and therefore no disposal is required afterwards. With the modular Filtration Group Vario system on the Filtration Group metal-edge filters it is possible to configure up to three filter cartridges above one another when high throughput rates are needed.

The filter can be cleaned either automatically or semi-automatically without interrupting operation. The concentrated solids are easily drained by opening the system for a short time.

The medium being cleaned is guided into the filter housing under pressure or in suction mode. It flows inward through the Filtration Group filter cartridges. The solids are separated on the surface of the triangular wires of the filter cartridge.

The filtered fluid exits the filter housing at the top opposite the inlet connection. In the AF 94 S version, the integrated preseparator relieves the filter cartridge of coarse and heavy particles by means of a tangential flow around the tube. Cleaning of the filter is performed either when a preset differential pressure limit is reached or after a specified cycle time elapses. Here the Filtration Group filter cartridges are rotated against spring actuated scrapers. The special gap geometry of the filter cartridge ensures efficient cleaning.

The particles or agglomerates are skimmed from the surface and settle in the collection cone. The patented bearing in the filter cartridges (AKF system) prevents high axial forces and simplifies the cleaning procedure.

The residue that settles in the collection cone can be emptied through the drain valve either when the machine is stopped or during filtration
On the Filtration Group metal-edge filter AF 74 S, coiled cartridges, welded cartridges, and perforated foils can be used.

  • Optimal cleaning with sharpedged triangular wire
  • Large effective filter surface
  • Precise, small gap widths
  • High differential pressure stability and torsional strength
  • Different material combinations possible
Element coiled cartridge
  • High wear resistance to abrasive media
  • Sturdy trapezoidal profile for high-viscosity media
  • Continuous welded design
  • Manufactured in stainless steel
Element welded cartridge
  • Specified sharp-edged hole diameter
  • Asymmetric hole pattern
  • Suitable for filtering fibrous waste material
  • Manufactured in stainless steel or nickel
Element perforated foil
AF-74-S-AF-94-S-operating

Technical data

Max. operating pressure:

16 bar, optional 25 bar / 40 bar
Max. operating temperature:

100°C, optional 200°C
Design according:

PED 2014 / 68 / EU
Cover fastening:

4 x M20 hexagon screws
Drive shaft seal:

Gland packing rings made of PTFE fibre with disc spring pretension
External finish:

Synthetic resin primer, blue (RAL 5007)

Connections and nominal diameters:

A-inlet:

DN 80, DN 100,DN 125, DN 150
B-outlet:

DN 80, DN 100,DN 125, DN 150
C-drain:

DN 50
G-indicator:

DN 25
threaded holes acc. to DIN 3852 form X:

AF-74-S-AF-94-S-tech

Materials:

Housing and cover:

Cast steel, 1.4571
Internals:

cast steel, stainless steel, AL
Bearing bushes:

PTFE based
Seals:

FKM (Viton), PTFE
Coiled cartridge:

1.4581; 1.4571 (∆p max. 30 bar) or Al, 1.4571 (∆p max. 10 bar)
Welded cartridge:

1.4571 (∆p max. 10 bar)
Perforated foil:

1.4571 or Al, 1.4571 or Al, Ni (∆p max. 10 bar)

Optional:

Ex protection acc. to ATEX 2014/34/EU:

Electrical design in Ex II 2G T3:

Mechanical design in Ex II 2G c T3:

Heating jacket:

ASME:

EN 13445:

AF-74-S-AF-94-S-tech

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    Performance curves

    AF-73-G-AF-93-G-curves

    Viscosity in 1 mm²/s
    Viscosity in 33 mm²/s
    Viscosity in 100 mm²/s
    Viscosity in 500 mm²/s

    y = volumetric flow V [l/min]
    x = gap width f [µm]

    The curves represent the volumetric flow through the entire filter system (filter housing including one filter element as an example) and refer to a differential pressure of 0.3 bar. Specific information about process data is essential for reliable operation of automatic filters.

    Important information about the performance curve! This is an example of a filter element of the type AF6016. The number of filter elements can be read from the type number key, see section 6.

    The curves represent the volumetric flow through the entire filter system (filter housing including one filter element as an example) and refer to a differential pressure of 0.3 bar. Specific information about process data is essential for reliable operation of automatic filters.

    Important information about the performance curve! This is an example of a filter element of the type AF6016. The number of filter elements can be read from the type number key, see section 6.

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