A water trap is not generally used on its own but as part of a multi step system to remove as much moisture from the air as possible.
Automatic compressed air water trap.
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It is especially used for applications that require extremely dry air such as painting sandblasting or powder coating.
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Coalescing separators utilize a filter element to trap contaminants in your compressed air supply as it moves through the filter.
Water in compressed air systems can result in other problems for your system too.
The liquid collects in a water trap and is removed through an automatic drain valve.
What is an air compressor water separator.
The dry air is then reheated to room temperature before it reenters the production lines.
The air will exit through a filter which traps other impurities in the air.