ALPHA In-Line Moisture Filter
Filling from a Shoebox, Alpha or Omega compressor, a quality
in-line filter should be used to remove all oil, water and particulates from the air..
This is the best and most safest filter made for filll a PCP
(Pre-Charged-Pneumatic) Air Gun.
We gaurantee our AlphaFilter is the best for the following reasons:
We use Molecular Sieve; Recognized in the industry as being the "best", it is
used in almost all breathing filters and other types of high pressure
filters where one needs to "scrub" the air.
|Adsorptive Capacity at low H20 Concentrations
|Rate of Adsorption
|Capacity for Water @77 F, 40% RH
|Separation by Molecular
|Adsorptive Capacity at Elevated Temperatures
2) High pressure filters work best at.......High Pressure.
When filling a high pressure tank with an inline filter, ensure the
filter has some kind of valving mechanism that allows the pressure to
build up prior to flow through the filter. This helps prevent the air
from flowing without obstruction. Filter media needs a "dwell time" as
well as high pressure to work best. Simply running air through a
cylinder with a filter element doesn't work well. Make sure the filter
has the proper valving to allow pressure to build up before the air
runs through it. without the valving, the air and moisture basically
rushes over the media at low pressures, and doesn't get scrubbed. The
pressure needs to be held back up to a point, and then allowed to flow.
3) One can't just pack beads in a cylinder for 2 VERY important reasons.
A) It doesn't work : We'd
all like to just make a filter that uses cheap beads packed in a
cylinder, but the first issue is that without proper packing,
"channeling" will occur between the media. Simply put, channeling is
the situation where air just goes around the individual filter "beads"
instead of being "scrubbed". In order to work, the media need to be
properly "jam packed" into the a container element, and this filter
element put in a filter tube. An element can be manufactured to be "jam
packed". Putting the media into a tube doesn't pack it tight enough to
prevent channeling at high pressures. Filter elements are rather
inexpensive, so it isn't an issue.
B) Most importantly SAFETY. NEVER make a high pressure filter where the filter material directly touches the cylinder walls of a high pressure filter.
This is filter element 101. The moisture in filter media leaches acid,
and hence must not come in direct contact with the filter tube. Acid
that leaches out will eventually make it to the threads on the end-caps
of the filter, weakening them, and eventually causing the high
possibility of catastrophic failure. This point can't be stressed
4) I have left out some of the more obvious points, such as ensure your
tubing can handle the pressure and is from a reputable source.