Diaphragm Design Manual - Simrit

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Convoluted Style - Figure 3:This formed style also has stroke capabilities slightly greater than flat diaphragms. A convolutedstyle diaphragm is one that has the clamping flange and the piston area on the same plane.Convoluted diaphragms are best known for their responsiveness and are well suited to applicationsrequiring stable set points such as regulators. Convoluted styles exhibit very low hysteresis.Figure 3 – Convoluted DiaphragmFlangeRadiusFabricSideCylinder DiameterPiston DiameterPistonRadiusConvolutionThicknessHeightFlangeThicknessPiston AreaThicknessFlange DiameterDesign Guideline – Convoluted Stroke Limit for Two Side Coated PartsFor two side coated, convoluted parts the suggested total stroke length is 2.13 times theconvolution width.This limitation does not apply to one side coated formed parts.Cylinder Diameter (CD) .25" / .99" 1.00" / 2.50" 2.51" / 4.00" 4.01" / 8.00" 8.01" & UpPiston Area Thickness .015" .017" .024" .035" .045"Flange Area Thickness .015" .017" .024" .035" .045"Convolution Thickness .015" .017" .024" .035" .045"Piston Radius .031" .063" .094" .125" .125"Flange Radius .031" .063" .094" .125" .125"Flange Diameter (Typ) CD + .75" CD + 1" CD + 1.5" CD + 2" CD + 2"Table 7 – Dimensional Guidelines for Convoluted and Drop Center DiaphragmsFormula 3 – Half Stroke for Convoluted DiaphragmsConvoluted Half Stroke 2 x Height Convolution Width 2 xFlange Radius© Copyright FNGP 200921
Formula 4 – Height Calculation for Convoluted Diaphragms1Convoluted Height ConvolutionWidth 2 x Flange RadiusFlange Thickness Half Stroke2Drop Center or Offset Convolution Style - Figure 4:Drop center formed diaphragms are convoluted diaphragms with a deeper center draw. This stylehas all the advantages of the convoluted style with longer stroke capability. Drop center styles canalso be easier to assemble than convoluted styles, particularly if a return spring or some otherhardware limitation doesn’t allow the piston surface and the flange to be on the same plane duringassembly. Please reference Table 7 for dimensional guidelines.OffsetHeightFabric SideFlangeRadiusCylinder DiameterPiston DiameterPistonRadiusConvolutionThicknessFlangeThicknessPiston AreaThicknessFlange DiameterFigure 4 – Drop Center DiaphragmDesign Guideline – Drop Center Stroke Limit for Two Side Coated PartsFor two side coated, drop center parts the suggested total stroke length is 3.7 times theconvolution width.This limitation does not apply to one side coated formed parts.Deep Draw or “Top Hat” Style - Figure 6:Deep draw formed diaphragms have the longest available stroke lengths among diaphragmgeometries. Their stroke capabilities are only limited by the chosen reinforcing fabric’s ability to beconformed to the necessary shape. Before assembly, deep draw diaphragms must be manuallyformed into the shape of a tall, convoluted diaphragm so they will roll properly (reference Figure 5).© Copyright FNGP 200922
Page 1 and 2: Diaphragm Design ManualFreudenberg
Page 3: Table of ContentsPageList of Tables
Page 8 and 9: IntroductionThe elastomeric diaphra
Page 10 and 11: . UL.c. ASTM.d. Internal.e. Other.1
Page 12 and 13: ElastomersThe elastomer brings litt
Page 14 and 15: Fluorosilicone (FVQM or FSI)Fluoros
Page 16 and 17: strength, but this strength also ma
Page 18 and 19: Diaphragm Construction StylesBefore
Page 20 and 21: Formula 2 - Blousing Flat Diaphragm
Page 24 and 25: One issue with deep draw diaphragms
Page 26 and 27: Selected Design TopicsCommon Causes
Page 28 and 29: from the piston in an expansion mod
Page 30 and 31: Figure 10 - The Changing Effective
Page 32 and 33: In this worst-case scenario, the to
Page 34 and 35: prior to assembly can also help red
Page 36 and 37: The Care and Housing of DiaphragmsA
Page 38 and 39: cut-and-try method may be the best
Page 40 and 41: Figure 18 - Gasketed DiaphragmBeads
Page 42 and 43: Figure 19 - Typical Sealing Bead St
Page 44 and 45: Design Guideline - Bead Compression
Page 46 and 47: elastomers at high temperatures —
Page 48 and 49: Glossary of TermsDiaphragm RelatedA
Page 50 and 51: Flange Radius - See Transition Radi
Page 52 and 53: Web Area, Working Areas, Working Zo
Page 54 and 55: Nervy - This refers to the excess s
Page 56 and 57: © Copyright FNGP 200955
Page 66: Diaphragm Design ManualFreudenberg

Diaphragm Design Manual - Simrit

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