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High Purity Compressed Air Filters Options and Technology

Filters play a critical role in the compressed air process. Depending on the end use, strict purity standards require the removal of a variety of contaminants such as oil aerosols, vapors and particulates.

KING Filters allow ultra-clean compressed air for packaging, fluidics, laboratories and instrumentation including compressed air filters, compressed air dryers, sub-micron filters, and filter-dryer combinations.

Filtering the entire compressed air system at one central location does not generally provide sufficient cleaning for all end-use applications. Moreover, most compressed air piping contains some amount of rust, scale, and condensed liquids. Water vapor that may be present in warm air will tend to condense into liquid when the air cools.

A compressed air filter installed just upstream of the end-use is generally the most efficient means of ensuring clean, dry air. These end-use filters can provide clean air to meet individual process requirements. A coalescing filter should be specified due to its long service life where liquid contaminants may be encountered. You should not undersize a compressed air filter.

Exceeding the listed flow rate of the filter will have a proportionate decrease in the service life of the cartridge elements. Frequent cartridge replacement necessitated by under sizing an application significantly increase maintenance costs. Maximum efficiency is generally obtained between 15%–100% of the maximum rating.

Many types of pneumatic equipment and processes use compressed air that must be clean, dry, and oilfree. This requires the removal of liquids, aerosols, dust, and solid particulates from the airstream. Generally, only condensed liquids need to be removed. Visible fog or mist is actually composed of condensed liquid droplets. These are easily removed by using a coalescing compressed air filter at the end-use point. Vapor is liquid in evaporated form. In this gaseous state, the liquid vapor will be invisible. Oil and water vapor are commonly present in compressed air systems. If either type of vapor must be removed, a compressed air dryer must be used. Desiccant dryers, for instance, use media that attracts the vapor molecules through a process called “adsorption”.

KING Ultra-C filters are available in three configurations to suit the specific application. All are based on the high efficiency coalescing action Ultra-C cartridge elements which remove oil, water, and particulate from the air stream. A compact single stage model doesn’t skimp on performance while offering a small footprint. The standard two stage color-change model incorporates a color change feature to signal the need for cartridge replacement. A combination filter-regulator-gauge comprises the Ultra-C Air Control Station. Each is offered with an automatic drain sump to reduce maintenance and assure continuous dry compressed air.

Larger capacity flow rates and more durable construction mark our KING Air Guard line of compressed air filters. As with all KING filters, they deliver extremely clean air for fluidic systems, critical instrumentation, packaging, paint, and coatings systems. Models rated for 60 scfm and up incorporate right angle inlet/outlet porting for optimal air line piping arrangement.

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