valco fittings
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VICI AG International Sales: + 41–41–925–6200 Fax: + 41–41–925–6201
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Filters
Pressed frit
Removable frit
Removable screen
tubing
pressed
frit
coned
liner
removable
frit
coned
liner
removable
screen
cone
cone
cone
* Patent Numbers 4,281,679 and 4,173,363
There are many flow elements of
analytical instruments which require
protection from foreign particles,
such as orifices that may become
plugged or surfaces that may get
scratched. However, conventional
filtering devices may have too large
a volume to be consistent with good
system performance – particularly in
chromatographic applications.
Valco’s unique patented* filter design
results in extremely low internal
volume and simplifies filter element
replacement. Filter bodies are “coned”
for uniform flow and maximum filter
surface area. The filters are made
entirely of metal, so they can be used
at any instrumentation temperature.
While the standard metal is 316 series
stainless, filters can be made from
alloys that can be used in virtually any
application.
We offer a choice of three different
filtering elements. All styles are
available in bulkhead configurations
for mounting on a panel or instrument
wall. (Please note that since frits and
screens have significantly different
thicknesses, they cannot be used
interchangeably in the same filter
body.)
Pressed frits
, permanently installed
in the filter, are recommended where
contaminants are the exception
and not the rule. The frits are 2µ
stainless.
Removable frits
are the best choice
for maximum filtration, or if the
application requires Hastelloy C or
titanium. However, they allow more
mixing and tend to clog more than
screens. A 2µ frit is included with the
filter, but 0.5, 2, and 10µ replacement
frits are available in three materials.
Removable screens
plug less
rapidly and provide lower pressure
drop than frits. Since they are
thinner, there is less mixing and
dispersal than might occur with a frit,
but frits provide better filtration. A
2µ screen is included with the filter,
and 2 and 10µ stainless replacement
screens may be ordered.
more information
Biocompatible filter . p 78
In-line filters for
1/4-28 fittings . . . . 78
Mobile phase
filters . . . . . . . . 79
CHROMalytic TECHnology Pty Ltd AUSTRALIAN Distributors e-mail:
Tel: 03 9762 2034
