valco fittings
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Valco InstrumentsCo. Inc. Sales:
800–367–8424
Fax: 713–688–8106
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25
Unions
overalllengthof
zerovolumeunion
isshorterthan
zerodeadvolumeunion
becausebore isremov
ed
more information
Reducingunions to
connect two tubeswith
differentODs . . p29-31
Unionswith
1/4-28fittings . . . . 72
Zerovolumeunion
(through-boreunion)
Zerodeadvolumeunion
(capillaryboreunion)
b
ore
tubingendsbutttoone
another. thefitting is
slightlylargerthanthe
tubingod.
tubing IDmatchesbore
ofunion
ZeroVolumevs.ZeroDeadVolume
techtip
Through-bore
Union Installation
Because the tubingwill
passall theway through
a through-boreunion,we
suggestmakingup the
first tube ina standard
Valcofitting toestablish
theproper lengthof
tubingextendingbeyond
the ferrule. Install this
made-upconnection in
the through-boreunion;
then the second tubecan
bebuttedagainst it for a
zerovolumeconnection.
A truezerovolumefitting isone in
whichnopartof thefittingactually
becomesapartof theflowpath.
TheonlyValcofittingswhichfit this
descriptionareour through-bore
unions,whichallow tubing tobutt
end-to-end. (So theseareonlyzero
volume if the tubeendsareperfectly
square.)
All otherfittingsaredesignedwith
zero
dead
volume: that is, there is
novolume introducedby thefitting
which isnot cleanly swept.
CHROMalyticTECHnologyPtyLtdAUSTRALIANDistributors e-mail:
: 03 97622034
