cheminertvalves
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Injector andSwitchingValveApplications
DetectorSelectionfromTwo
ColumnsorOneColumnand
AuxiliaryCarrier
Thisuniqueconfigurationallowsanalyses
ofdifferentpartsof oneanalysis
with twodifferentdetectors,without
splittingormultiple injections.
MicrovolumeSample Injection
The internal sample (fixedvolume)
flowpath isusedwhenvery small sample
volumesare required. The sample size is
determinedbyapassageengravedon the
valve rotor,allowingprecise, repeatable
injections. InPositionA, the sample
flows through the samplepassagewhile
themobilephaseflows through to the
column. The thirdpassage is inactive. In
PositionB, the samplepassage is in line
with thecolumnand themobilephase
injects thecontentsof the samplepassage
into thecolumn.Thepassagewhichwas
inactive inPositionAallows the sample to
continueflowingwithout interruption.
4port switchingvalve
4port internal sample injector
These illustrations showbasic sample injection techniques
usingValco twopositionvalves. With rareexceptions, there
isnodifferencebetween switchingvalvesandexternal
volume samplingvalves,so the samevalvecanbeused for
either function.
Theuniqueadvantageof 8and10port valves is that they
reduceextracolumnvolumebycombining sampling
and switching functions ina singlevalve. Thisminimizes
expense,maintenance,service,and riskof leaksas
compared tomultiple6port valve systems.
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CHROMalyticTECHnologyPtyLtdAUSTRALIANDistributors e-mail:
: 039762 2034
