Siemens VGD20.253U - Operation

VGDSeriesDoubleValves TechnicalInstructions
 DocumentNumberCC1N7631us
 November08,2017
SiemensAGBuildingTechnologiesDivision Page 7
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Specifications
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Physical
characteristics
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Bodymaterials SeeTable2
Weight SeeTables4
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Connections
Pipeconnections NPTthreadsorANSIclass150flanges
(seeTable2)
Pressureandventtaps SeeTables2and3
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Operation
AllVGDxx.xxxUgasvalvesarenormallyclosed,two‐wayvalves.Thevalveshaveastandard,
integral,stainlesssteelmeshfilter(0.9mm)intheinlettoprotectthedownstream
componentsagainstcontamination.
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Allvalveshave¼NPTportsforpressuretestconnection.Afullsizeventconnectionplateis
available
asanaccessoryforVGD40.xxxUvalves.
SeeTable2and3fordetailsonportsandventconnectionplates.
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AGF10...
AGF10...
7631z50us/0815
Figure1.SectionalviewofVGD20.xxxU
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VGD20.xxxUdoublevalvesconsistoftwovalvesinseries.
Thefirst(inlet)valvehasaflatvalvediscsuitableforthesafetyshut‐offfunctiononly.
Thesecond(outlet)valvehasacontouredvalvediscforstableregulatingcontroland
smoothreleaseofgas.
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