Filters

Filters are necessary to reduce particulate contaminants and separate moisture from the compressed air - both for the entire plant and at the machine level. Filters are available in a wide range of sizes, with inlet and outlet port sizes ranging (typically) from 1/8" NPT to 1" NPT. Filters use replaceable filter elements, which are available in different grades: standard filters are available to remove particles from 40 µm down to 5 µm in size, while coalescing type filters for select models can remove fluid particulates as small as 0.01 µm and vapor down to 0.003 µm in size.

How much is enough

All pneumatic components can benefit from filtration, but keep in mind that a filter that is too fine for the application can quickly become blocked. While a 40 µm filter works well to protect valves and cylinders, process instrumentation or high speed pneumatic tools may require fine particle filtration. Special, finer filters may also be needed for food, pharmaceutical and paint shop applications. Specify a coalescing filter if oil vapors or aerosols need to be removed from the air stream.

How many are needed

As noted above filtering is generally provided at the plant level AND at the machine level. Consider using additional filters when individual actuators or small subsystems are widely spread throughout a facility (think conveyor systems) especially if they are plumbed with metal pipes. Particulates from flaking, rust, and corrosion are much more prevalent in metallic piping than is generally seen with tubing and hoses.

Bowls and Drains

Filters usually incorporate a bowl to trap and collect liquids as they are separated from the air. These bowls are removable to facilitate cleaning and to allow easy replacement of the filter elements contained within. The bowls are also equipped with either manual, semi-automatic or automatic drains to purge the trapped liquid that has been separated from the air.

• The manual drain is a simple valve, and must be actuated periodically to purge the collected liquid.
• Semi-auto drains are similar to check valves, they open and drain when pressure is removed, and then close when pressure is reapplied.
• The fully automatic drain automatically opens when the liquid in the bowl reaches a certain level.

A variety of accessories are available to mount these filters individually, OR in combination with regulators, lubricators, shut off valves and other accessories.

HELPFUL HINT: Specify FRL components with the same fitting sizes for ease of connection and mounting.

Air Filters start at $24.00

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