valco fittings
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HPLC Column End Fittings
Although our column end fittings
look like ordinary reducing unions,
they are machined with a conical
recess to match a specific column
ID so that there are no abrupt or
irregular diameter changes which can
cause loss of theoretical plates.
(See
illustrations, below.)
This optimization
results in an assortment of column end
fittings for each column OD. To receive
full benefit of this design, use column
end fittings only with the specific
column ID for which they are intended.
We can design special fittings for
unusual sizes or OEM use.
If a temporary frit is used during
column packing, the frit OD should
match the column OD. Permanent frits
should have an OD matched to the
column ID, and should be pressed in to
give the lowest dead volume. Our frits
are available in a variety of pore sizes,
more information
Frits . . . . . . page 45
tech tip
When packing columns,
use Valco“through-
type”unions to couple
the column to the
packing reservoir.
Size
Prod No
1/16" union ZU1T
1/8" union ZU2T
1/4" union ZU4T
Through-type unions
for packing
columns . . . page 26
tech tip
Standard column end
fittings are Type 316
stainless, but since the
column wall and frit form
over 99% of the column
surface area, standard
fittings with titanium
frits can generally be
used on inert columns.
External column end fitting
1/4" to 1/16", 4.6 mm column ID, with removable frit
(ECEF414.6F)
Internal column end fitting
1/4" to 1/16", 4.6 mm column ID, with removable frit
(CEF414.6F)
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and we offer titanium and Hastelloy C
frits for systems sensitive to exposed
stainless steel.
All column end fittings are rated to
10,000 psi. However, the functional
limit is dictated by the yield strength
of the tubing used with the fitting.
Standard 1/4", 3/8", and 1/2" columns
are usually packed at 8,000-10,000 psi,
which is right at the yield strength for
the tubing commonly used. Columns
with 1" ID have a yield strength of
6,000‑8,000 psi, and the fitting will not
hold if the system pressure exceeds
that limit.
The newest addition to the line is the
Nanovolume® column end fitting.
(See page 62.)
These all-PEEK fittings
feature fingertight zero dead volume
connections with 100 or 150 micron
bore. PEEK sleeves permit use with any
fused silica tubing.
CHROMalytic TECHnology Pty Ltd AUSTRALIAN Distributors e-mail:
Tel: 03 9762 2034
