Siemens VGD20.253U - Page 8

TechnicalInstructions VGDSeriesDoubleValves
DocumentNumberCC1N7631us 
November08,2017
Page8 SiemensAGBuildingTechnologiesDivision
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Operation,continued
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7631z53us/1215
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Figure2.SecondviewofVGD40.xxxUflangemodels
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VGD40.xxxUdoublevalvesconsistoftwovalvesinseries.
Eachvalvehasadoubleseattoachievehighflow(seeFigure2 ).
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Closingsprings:
Eachdoubleseatusesonepairofsprings.Thespringforcesactseparatelyasclosing
forceson
theindividualvalveseats.
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