I've got one of those, but it's not a dryer. It does capture liquid
water that has already condensed from the air due to cooling between
the compressor head and the filter, but the air is probably still near
100% relative humidity. The filter removes solids and liquids, but does
nothing about water vapour in the compressed air. So if you chill the
air further you can get more water condensing out.
An air dryer either has to chill the air well below room temperature, or
use some chemical means to remove the moisture from the air. The
original question was asking about the latter.
you're looking for an air drier. harbor freight has one. desiccants aren't
going to be enough to deal with the airflow. it will also probably be fouled
with any oil in the air.
Search for desiccant at www.grainger.com. But as previous poster
suggested, an oil/water separator is the usual method of drying out
compressed air. I believe (not sure) you'd only use silica gel
desiccant dryer if you needed very, very dry air. For regular shop
tools, the conventional separator is fine. I believe, once again not
certain, that you'd lose more air pressure thru a desiccant dryer.
(Another method is an after-cooler - essentially passes the air thru a
refrigerator - cold air holds less moisture than warm and so the vapor
condenses and drops out.)
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