VALVES
147
Micro-MeteringValves
XX
Flow rates as low as 3.5µL/min*
XX
1/4-28 flat-bottom and10-32 coneddesigns available
XX
Materials of construction: PEEK, PTFE
For fine control of fluidflow rates,Micro-MeteringValves can reduce
outgoing flow to as low as 3.5 µL/min*. These needle valves are
perfect for usewithperistalticpumpfluid-transfer applications,mass
spectrometry, and fractioncollection.
Upchurch Scientific
®
Micro-Metering Valves can also be used to
regulategas flow inhelium sparging lines and as a flow-dependent
variablebackpressure regulator. For flow independent regulationof
backpressure, please seepages 152–153.
Flowpathmaterials arePEEKpolymer andPTFE. All versions of this
valvehave0.020” (0.50mm) thru-holes.
*At 1.0mL/min incomingflow ratewith room temperaturewater.
P-445
1/4-28 threaded
PEEKMicro-MeteringValve
PartNo.
Material
ODTubing Thru-hole
Internal
Volume* Includes
MICRO-METERINGVALVES
P-445
PEEK, Black 1/16”
0.020” (0.50mm)
7.7µL
(2) XP-230
P-446
PEEK, Black 1/16”
0.020” (0.50mm)
7.2µL
(2) F-120
P-447
PEEK, Black 1/8”
0.020” (0.50mm)
7.7µL
(2) XP-330
*Maximum internal volume,withvalve fullyopen.
APPLICATIONNOTE
BackPressureConsiderations
TheMicro-Splitter Valvesaredesigned toworkwhenbotheffluent flow
pathpressuresarenearly identical.However, the split flowpathwill often
havehigherbackpressure than thewasteflowpath,making it hard to
achieveany split flowat all. Thereare twopossible solutions. Placea
backpressure regulator (seepages152–153) on thewasteflowpath that
isequal toor slightlygreater than thepressureon the split flowpath.
Or, switch the twoeffluentpathways such that the split flowpathway is
attached to the“waste”port on the valveand thewasteflowpathway
isattached to the“split”port on the valve.
(PleaseNote: This second
methodmay result ina lossof adjustment sensitivity.)
Prime/PurgeValve
Airwithin thepumpheadcancausenoisypumpoperationandflow
instability. Solve thisproblembyplacingaHighPressureMicro-Splitter
Valve (page146) inlinebetween thepumpand the injector valve. Youcan
then safelydivertpumpflow toawastecontainer at a sufficient rate to
dislodge theair. Removeair from the solvent line leading to thepump
withaPrime/PurgeValve (page155).
Multi-ColumnandDetector Systems
Does yourwork requireanalyseswithmultiplecolumnsanddetectors
that use the samemobilephase? If so, install oneof ourHighPressure
Micro-Splitter Valvesafter your injector.A single injectioncan thenbe
split to two separatecolumnsanddetector systems, at twodifferent flow
rates. Thiseconomical set-upeliminates theneed for anadditional pump
and injector valve,whileallowingdata tobeobtained simultaneously.
Post-Detector Interfacing
UseaStandardMicro-Splitter Valve to routefluidexitingan initial
detector tootherdevices, suchasamass spectrometer anda fraction
collector. The valvewill split and reduce theflow rate to that required for
MS interfacing,whilediverting the remainder of theflow to thecollector
(abackpressure regulatormayalsobe required for this set up, available
onpages152–153).
OtherApplications
Thesevalvesarealsosuited forotherapplications, suchasadaptinga
standardHPLCsystem tohandlemicroboreanalyses.Formore information
andplumbingdiagrams for thisapplicationand those listedabove,please
contact your localdistributoror IDEXHealth&Sciencedirectly.
0.73”
(1.85cm)
1.28”
(3.25cm)
Thumbscrew
0.49”
(1.24cm)
OUT
IN
Micro-MeteringValves
