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Coalescing filters
To improve upon filtering characteristics offered by standard filters,
coalescing filters
are often used. These filters
are suitable for removing the oil vapors in the compressor, which are not removed by the traditional systems.
In these types of cylinders we have a different direction of flow and a different type of filter element.
Figure 14
Pos. 1
: the air enters directly into the filtering element, which comprises several layers of different materials; the
outer metal mesh restrains these layers in the presence of air-bursts arising from the initial input of compressed
air entering the filter.
Pos. 2
: to optimize the use of these filters they should be assembled downstream, i.e. positioned sequentially to
other filter elements, hence the air undergoes an ever higher level of pre-filtering.
1
2
Fig. 14
These filters have cartridges with a level of filtration, which varies from manufacturer to manufacturer, and
generally varies from 0,1 to 0,01 microns. The smaller the particles to be intercepted, the smaller the passage
sections of the compressed air, and consequently the lower the flow rate.
As a result of the limited flow rate, these filters are not used to power the entire system of the machine, but only
the most critical parts.
2
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AIR PRODUCTION AND PREPARATION