AF 72 G METAL-EDGE FILTER

AUTOMATIC FILTER

AF 72 G METAL-EDGE FILTER

AUTOMATIC FILTER
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  • MECHANICAL MARKET

    PROCESSING OIL

    Suitable for all applications where low or high-viscosity liquids or pastes have to be filtered and homogenised

Filtration Group (ex Mahle) automatic metal-edge filters are suitable for all applications where low or high-viscosity liquids or pastes have to be filtered and homogenised.
These compact inline filter systems can be designed for semi or fully automatic cleaning. The system is cleaned by rotating the filter cartridge against a spring actuated scraper.

With radial scraper cleanings

CONNECTION SIZE G1 1/2, FLANGE DN 40

Multiple advantages

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    Extended filter

    Extended filter service life due to the use of a cleanable element

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    No interruption

    Cleaning is possible without interrupting filtration

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    Separation quality

    Precise separation quality in accordance with the metal-edge principle

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    Filter cartridge

    Sturdy filter cartridge made of triangular stainless steel wire on a rugged core element

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    Efficient cleaning

    Efficient filter cleaning assures maximum process stability

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    Long service life

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

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    Filter selection

    Filtration Group modular Vario system for optimum filter selection

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    Wide range of applications

    Material variants open up a wide range of applications

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    Gastight shaft

    Gastight shaft seals available optional

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    Application in Ex zone

    Application in Ex zone 1 and 2 optional

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    Maintenance

    Easy maintenance

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    Distribution

    Worldwide distribution

Operating principle

The Filtration Group AF 71 G metal-edge filter belongs to the small Vario series. The Filtration Group metal-edge filter system is used to filter and homogenise a wide range of liquids and pastes. This compact, inline filter system consumes no filter material, which means there is also no need for subsequent disposal. The filter is cleaned either automatically or semi-automatically without interrupting operation. Optional a pneumatical rotary drive is also available. Its advance is given by use with the differential pressure measure and display unit with integrated control funtion PiC 3170 MFC. Autarcic automatic filters can be combined without need of a power station for a 3-phase motor. 24 V DC field voltage and compressed air as auxilliary energy are sufficient. The concentrated solids are drained off simply by opening the system for a short time. The medium to be cleaned is guided into the filter housing under pressure or in suction mode. It flows inward through the Filtration Group filter cartridge. The solids are separated on the surface of the triangular filter cartridge wires. The filtered fluid exits the filter housing at the top opposite the inlet connection. The filter is cleaned either when a preset differential pressure limit is reached or after a specified cycle time elapses. The Filtration Group filter cartridge is rotated against a spring actuated scraper for this purpose. The special gap geometry of the filter cartridge guarantees efficient cleaning. The particles or agglomerates are skimmed from the surface and settle in the collection cone. The patented filter cartridge bearing (AKF system) prevents high axial forces and facilitates the cleaning process. The residue that has settled in the collection cone can be emptied via the drain valve either when the machine is at a standstill or during filtration.

  • Optimum cleaning by means of sharp-edged triangular wire
  • Large effective filter surface
  • Small, precise gap widths
  • High differential pressure stability and torsional strength
  • Several material combinations possible
Element coiled cartridge
  • High wear resistance to abrasive media
  • Sturdy trapezoidal profile for high-viscosity media
  • Welded design
  • Manufactured in stainless steel
Element welded cartridge
AF-72G-operating

Technical data

Max. operating pressure:

16, 40, 63 bar
Max. operating temperature:

100 °C up to 63 bar
Cover lock:

4 x M16 hexagon screws
Drive shaft sea:

Gland packing rings made of PTFE fibre with disc spring pretension; optional lip seal with O-ring
External finish:

Synthetic resin primer, blue acc. to RAL 5007

Connections and nominal diameters:

A-inlet:

G1½ threaded holes DIN 3852 form Z flange DN 40
B-outlet:

G1½ threaded holes DIN 3852 form Z flange DN 40
C-drain:

G2 DIN 3852 form Z
G-∆p-Connection:

G1/8 DIN 3852 form X
AF-72G-technical

Materials:

Housing and cover:

Nodular cast iron 40
Internals:

Nodular cast iron, steel, optional stainless
Optional interior coat:

Bearing bushes:

PTFE based
Seals:

FPM (Viton)
Coiled cartridge:

Al, 1.4571 (∆p max. 40 bar)
Welded cartridge:

1.4571 (∆p max. 10 bar)
AF-72G-technical

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    Performance curves

    AF-71H-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 indicate the volume flow through the complete filter system (filter housing including element) and are referred to a differential pressure of 0.3 bar. Specific process information is essential to guarantee reliable operation of an automatic filter.

    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.

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