Siemens VGD20.253U - Page 2

TechnicalInstructions VGDSeriesDoubleValves
DocumentNumberCC1N7631us 
November08,2017
Page2 SiemensAGBuildingTechnologiesDivision

Features
AllModels
 ULlisted,FMapproved,CSAcertified,IRIapprovable,ISO9001and14000certifie d.
CE,Australianapprovedversionsavailable
 ¼“‐inchNPTpressuretapsontheinletandoutletandbetweenmainvalves(seeTable2
fordetails)
 Stainlesssteelmeshinletfilterprotectsthevalveseat(s)aswell
asdownstream
components
 Dualstemguidesensureprecisediscalignmentandtightshut‐off
 ValvesinconnectionwithSKPxx.xxxUactuatorsopenslowlyandcloserapidly

VGD20.xxxUmodels
 CompactVGD20.xxxUdouble‐valvebodiesconsistof2safetyshut‐offvalvesinseries.
Thefirst(inlet)valvehasaflatvalvediscapplicableforsafetyshut‐offfunctiononly.
Thesecond(outlet)valvehasacontouredvalvediscforusewithpressureregulating
actuators(SKP2x.xxxU,SKP5x.xxxU,SKP7x.xxxU) 
 A
1‐inchNPTventconnectionbetweenthevalves
 EachVGD20.xxxUdouble‐valverequires2threadedmountingflanges(AGFxx.xxU).Each

flangeincludesthenecessaryinstallationhardware(bolts, nutsandO‐ring).Eachmounting 
flangehasa¼‐inchNPT pressuretap.Theflangescanbepre‐mountedontothepipe,and 
thenboltedontotheVGD20.xxxUgasvalvebody.Thisfeatureeliminatestheuseofpipe 
unionsandpermitsthegasvalveassemblyto beeasilyremovedfromagastrain
 Connectingpatternofthe1...2inchAGFxx.xxUflangesareidentical.Thisspacepermits
anyAGFxx.xxUflangetobemountedtoanyVGD20.xxxUvalvebody



NOTE:
VGD20.xxxUvalvesandAGFxx.xxUflangesmustbeorderedasseparateitems(see
Tables2and3).

VGD40.xxxUmodels
 CompactVGD40.xxxUdouble‐valvebodiesconsistof2safetyshut‐offvalvesinseries
 Eachindividualsafety shut‐offvalvehasdoubleseatstoachievehighflow
 Patentedseatconstructionwithindividualclosingspring foreachseattoassurereliable
shut‐offandhighclose‐offpressurerating

 Fullportventlineconnectionplatesareavailable



NOTE:
VGD40.xxxUvalvesandAGA40.xxxxUventconnectionplatesmustbeorderedas
separateitems(seeTables2and3).
