
Compressed Air Line Filter
Compressed air line filter
Why Compressed Air Filtration is Necessary
One cubic foot of compressed air can contain millions of dirt particles, considerable amounts of water and oil — and even heavy metals like lead, cadmium and mercury. If they are not filtered out, trouble-free operation of the system components, like valves and cylinders, cannot be guaranteed in the long term. Poorly prepared compressed air can contaminate control valves, and cause seals to swell and wear prematurely. As a result, the right compressed air preparation is essential for reducing machine downtime, and for reducing maintenance and energy costs.
Types of Filters and Air Treatment Equipment
There are different types of air treatment components for removing contaminants, such as solid particles, liquid water, water vapor and oil vapors, odorants, and even bacteria and viruses. For most automation applications, the focus is to remove solid particles and water.
Water Separators remove condensate, either with a centrifugal design or a coalescing principle.
A centrifugal separator causes a rotary motion in the air, forcing particles to accelerate in a radial outward movement. Once they reach the outside, they drain into the bowl. These are effective for removing water droplets, as well as dust and dirt particles larger than 5 microns in size. No maintenance is required for this process.
A coalescing separator flows the air from the inside to the outside of the filter element. These filter cartridges must be replaced regularly.
Fine and micro filters remove particles smaller than 1 micron, down to 0.01 micron. The air flows through the filter cartridges from the inside to the outside. Solid particles get stuck in the filter cartridge, clogging it up. Fluid particles, such as condensate or oil, coalesce or attach to larger droplets, which flow off and are caught in the filter bowl. It is important to cascade your filters to avoid prematurely clogging the filter element. For example, if 1-micron filtration is needed, it is recommended to use a 5-micron filter upstream so that the 1-micron filter does not become clogged with larger particles.

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