valco fittings
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ValcoFittings
The twopiececompressionfitting (
Figure1
), inwhicha ferrule is compressed
onto the tubeasanut is tightened,offers reliability inhighpressure situations
and inconnectingmetal tubing. Valcoexcels inall critical areasof thedesign
andmanufactureof suchfittings. Qualityconsiderations,whichcannotbe
ignored if ananalytical system is to reachandmaintainoptimumperformance
levels, include interchangeability,counterbore tolerances, ID/ODconcentricity,
mixingpotential,cleaningprocedures,and themethodemployed to“makeup”
the ferruleon the tube.
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Figure1
Valcocompressionfitting
NoTubingDeformation
Thebasicconceptof compression
fittings carries the inherentdangerof
tubedeformation (
Figure2
). While
somemanufacturersemphasize this
positivelyasamethodof ensuring
that the tubingdoesn’tblowoutof the
ferrule, theflowanomalies introduced
by the restricted IDmake thesefittings
apoor choice formany instrument
applications.
techtip
Foroptimal zerodead
volumeconnections,
make sureyour tubing
meets thebest industry
standards—OD tolerance
shouldbenominal
dimension± .002".
Fractional
Nominal
dimension dimension
1/32"
.031
1/16"
.062
1/8"
.125
1/4"
.250
3/8"
.375
1/2"
.500
caution!
Theanalytical devices
markethasattracted
numerous companies
whichcopyValco/
Cheminertdesigns.
Pleaseexercisecaution in
theuseof copies,which
maynotbecompatible
with theoriginal versions
in this catalog.
BecauseofVICI’shigh
volumeproductionand
dedicatedmachinery,
ourfittingsareoften
lessexpensiveandof
consistentlyhigher
quality thancompeting
copies.
Valcometal ferrules cut a ringnear
theendof the tube (
Figure3
),which
prevents tube releaseathighpress-
ureswithout significantlydeforming
and restricting the tube interior.
Becauseour ferruleshavea sharpedge
at the IDnear thenose, thisusually
takesonlyabout 1/4 turnbeyond the
pointwhere the ferrulefirst starts to
grab the tubing. There is so little tube
distortion that theyare routinelyused
withglass-lined tubing! OnlyValco’s
polymerfittings relyon friction tohold
a tube.
CHROMalyticTECHnologyPtyLtdAUSTRALIANDistributors e-mail:
: 03 97622034
