valco fittings
|
Valco InstrumentsCo. Inc. Sales:
800–367–8424
Fax: 713–688–8106
|
Introduction
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Figure2
ID restriction
incommoncompressionfitting
Figure3
No ID restriction
inValcocompressionfitting
Figure4
a. Tubing seats correctlyatbottomofdetail
b. Tubingdoesn’t reachbottomofdetail,
introducingdeadvolume
c. Tubing reachesbottomofdetail before
ferrule seats
Interchangeability
Valcofittingdetailsaredesignedwith
aconsistentpilotdepth,permitting
reliable interchangeabilityas con-
nectionsare revisedorfittingsare
replaced. This interchangeability
extends throughout theValcoand
Cheminertfittingandvalveproduct
lines. Indeed, theValco standardhas
been sowidelycopied thatValcoand
Cheminertfittingsare, ingeneral,
fully interchangeablewith those
of ourmajor competitors. In initial
installations,Valco ferruleswill often
improveothermanufacturers’fitting
connections.
Becauseof variations in tubingOD
and inpilot and taperdesigns from
manufacturer tomanufacturer, the
amountof tubingextendingbeyond
themadeup ferrulecanvary. (The
most radical variation is in thefittings
manufacturedbyWaters. Basedon
theoldSwagelokdesign, theyhave
apilotdepthconsiderably longer
than standard.)
Figure4a
showsa
properlymadeupfitting. If that same
fitting is installed inadetailwhich
wasdesigned for a slightly longer
tubeextension (as in
Figure4b
),dead
volumewill be introduced. In the
oppositecase,with thepilot shorter
than thepilotdepth (
Figure4c
),
the tubewill bottomoutbefore the
ferrulehas sealed. However,our tests
prove that except in themost extreme
cases,aValco ferrulewill“creep”on the
tubinguntil it reaches thebottomof
the ferrule taper,makingaproper seal.
ReliablyClean
Mostof our stateof theartCNC
machinesusewater-based lubricants.
After eachpart comesoff the
machine, it is cleanedwithwater-
solubledetergentsand then rinsed
inhotdeionizedwater. Finally,every
metal fitting thatwemake isgiven
a thoroughcleaningwith steam
fromdeionizedwater at 140°C. Any
critical partsprocessedwithoil-based
lubricantsarebaked to removeall
traces. Thepractical resultof theextra
effort is this: youdon’thave tobe
concernedabout solvent residues.
CHROMalyticTECHnologyPtyLtdAUSTRALIANDistributors e-mail:
: 03 97622034
