MAHLE automatic filters AF 112 G and AF 172 G

Press release [PDF; 38 KB]
Press release [RTF; 1205 KB]


For filtration of low-viscosity fluids, such as lubricating oil, fuel, and process water (bilge), MAHLE automatic back-flushing filters, such as the AF 112 G and AF 172 G, are universally applicable. These filters are part of the small Vario series, and round out the range of automatic filters with low flow rates.

The compact, in-line filter systems are equipped with automatic cleaning. The cleaning process is done by rotating the filter element and back-flushing with internal or external pressure media.

Product features:

• Low life-cycle-cost as filter materials are not used
• Cleaning without interruption of filtration
• Precise separation quality, using the surface filter principle
• High-quality, asymmetric filter medium made of repeatedly sintered stainless steel wire mesh on a robust carrier
• Process reliability through efficient filter cleaning, using internal or external pressure media
• Long service life due to solid construction and high-quality materials
• Low fluid loss in the cleaning process
• Segment-by-segment filter cleaning, with high back-flushing impulse
• Indication of actual filter rating and nominal separation
• Integrated preliminary separation of coarse particles through tangential inflow and dip pipe
• Material variants for a wide variety of applications
• MAHLE Vario modular system for optimum filter selection
• Maintenance-friendly design

Principle of operation
The MAHLE AF 112 G and AF 172 AG back-flushing filters are part of the MAHLE Vario series. The compact MAHLE automatic filter system is used for micro and fine filtration of a wide range of low-viscosity fluids. These in-line pressure filters do not consumefilter materials. Subsequent disposal is therefore unnecessary. Cleaning can be done without interrupting operations. The medium to be cleaned is fed into the filter housing under pressure, and fluid flows through the MAHLE segmented filter element from the outside to the inside. Particles build up on the surface of the filter medium, and the filtered fluid leaves the filter housing at the top, across from the inlet connection. The integrated preliminary separation particularly frees the segment element of coarse, heavy particles; this is made possible by a dip pipe and guide edges with tangential flow around them.

Cleaning can be selected to be done when a preset differential pressure, selected interval, or quantity of fluid filtered is reached. The AF 112 G filter series is back-flushed using the infeed pressure, retrieved by a throttle point after the filter, while the AF 172 G uses external pressure supplied by an outside source. The segmented filter element is rotated, while the cleaning valve, and the outside valve (only AF 172) as well, are opened. The segments pass the opposite located outside pressure nozzle (only AF 172) and the flush channel (external). During rotation the nozzle and accordingly the flush channel are opened and closedalternately. While back-flushing a pressure burst cleans out the separated particles from the filter material in each segment. This impulse cleaning flings the particles outward, and they are collected in the rinse channel and discharged with a small amount of liquid. One rotation is enough to clean all the segments. The residue deposited in the collector cone can be emptied out through the drain valve during idle periods or during operation. All filters in the MAHLE Vario series are protected by various patents.

MAHLE Industriefiltration has been producing high-quality industrial filters for fluid technology, air filtration, and process technology for many years. As an innovative, reliable development partner and supplier all over the world, MAHLE Industriefiltration is your expert partner in all areas of filtration and separation. MAHLE Industriefiltration is an independent service area with its own engineering, production, and sales team, integrated in the MAHLE Group, and thus is backed by the strength of a worldwide market leader. The MAHLE Group is one of the top 30 automotive suppliers and the globally leading manufacturer of components and systems for the internal combustion engine and its peripherals. Around 35,000 employees work at over 100 production plants and eight research and development centers. In 2009, MAHLE generated sales of approximately EUR 3.9 billion.

Öhringen, 11/2010