valco fittings
42
|
VICIAG International Sales: +41–41–925–6200 Fax: +41–41–925–6201
|
HPLCColumnEndFittings
Althoughour columnendfittings
look likeordinary reducingunions,
theyaremachinedwithaconical
recess tomatcha specificcolumn
ID so that therearenoabruptor
irregulardiameter changeswhichcan
cause lossof theoretical plates.
(See
illustrations,below.)
Thisoptimization
results inanassortmentof columnend
fittings for eachcolumnOD. To receive
full benefitof thisdesign,usecolumn
endfittingsonlywith the specific
column ID forwhich theyare intended.
Wecandesign special fittings for
unusual sizesorOEMuse.
If a temporary frit isusedduring
columnpacking, the fritOD should
match thecolumnOD. Permanent frits
shouldhaveanODmatched to the
column ID,and shouldbepressed in to
give the lowestdeadvolume. Our frits
areavailable inavarietyofpore sizes,
more information
Frits . . . . . . page45
techtip
Whenpackingcolumns,
useValco“through-
type”unions tocouple
thecolumn to the
packing reservoir.
Size
ProdNo
1/16"union ZU1T
1/8"union ZU2T
1/4"union ZU4T
Through-typeunions
forpacking
columns . . . page26
techtip
Standardcolumnend
fittingsareType316
stainless,but since the
columnwall and frit form
over 99%of thecolumn
surfacearea,standard
fittingswith titanium
frits cangenerallybe
usedon inert columns.
External columnendfitting
1/4" to1/16",4.6mmcolumn ID,with removable frit
(ECEF414.6F)
Internal columnendfitting
1/4" to1/16",4.6mmcolumn ID,with removable frit
(CEF414.6F)
�������������
���
�������
����
�����
������������
������������
���������
������������������������
�������������������������
����
������
���������
����
����
�������������
���
�������
����
�����
������������
������������
���������
������������������������
�������������������������
����
������
���������
����
����
andweoffer titaniumandHastelloyC
frits for systems sensitive toexposed
stainless steel.
All columnendfittingsare rated to
10,000psi. However, the functional
limit isdictatedby theyield strength
of the tubingusedwith thefitting.
Standard1/4",3/8",and1/2" columns
areusuallypackedat 8,000-10,000psi,
which is right at theyield strength for
the tubingcommonlyused. Columns
with1" IDhaveayield strengthof
6,000‑8,000psi,and thefittingwill not
hold if the systempressureexceeds
that limit.
Thenewest addition to the line is the
Nanovolume®columnendfitting.
(Seepage62.)
Theseall-PEEKfittings
featurefingertight zerodeadvolume
connectionswith100or 150micron
bore. PEEK sleevespermitusewithany
fused silica tubing.
CHROMalyticTECHnologyPtyLtdAUSTRALIANDistributors e-mail:
: 03 97622034
