Diaphragm Design Manual - Simrit

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One issue with deep draw diaphragms is that they can occasionally invert in the convolution area asthey cycle. Using an appropriately designed piston along with a curved lip retainer plate to lock thepiston and radii of the diaphragm to the hardware can control this issue.Curve LipRetainerPistonSkirtFigure 5 – Diaphragm Assembly With a Curved Lip RetainerDesign Guideline – Deep Draw Maximum Convolution HeightThe maximum recommended stroke length for deep draw diaphragms is determined bykeeping the height of the diaphragm less than, or equal to, the diameter of the bore.For best functional results, these styles must be used with well-guided pistons andsupported by sufficiently long piston skirts.PistonRadiusCylinder DiameterPiston DiameterFabricSideFlangeRadiusPiston AreaThicknessHeightFlangeThicknessFlange DiameterSidewallThicknessFigure 6 – Deep Draw DiaphragmCylinder 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 .094" .125" .156" .250" .250"Flange Radius .031" .063" .094" .125" .125"Flange Diameter (Typ) CD + .75" CD + 1" CD + 1.5" CD + 2" CD + 2"Table 8 – Dimensional Guidelines for Deep Draw Diaphragms© Copyright FNGP 200923
Formula 5 – Height Calculation for Deep Draw DiaphragmsDeep Draw HeightFlangeRadius 1.56 ConvWidth Half Stroke Flange Thickness 2.SF Formula 6 – Half Stroke for Deep Draw DiaphragmsDeep Draw HalfStrokeFlangeRadius 1.56 ConvWidth Height Flange Thickness 2.SF Cylinder DiameterSafety Factor (SF)Table 9 – Calculation Safety Factors.25 / .99 1.00 / 2.50 2.51 / 4.00 4.01 and Up0.06 0.10 0.12 0.14Double Tapered Deep Draw Style - Figure 7:As a way of reducing the Circumferential Compression a rolling convolution normally goesthrough during its stroke cycle, a standard deep draw diaphragm can be augmented with a secondtaper. By adding this second taper, the main sidewall angle is greatly reduced thereby reducing thecircumferential compression increasing the life of the diaphragm.Please also review the discussions on Circumferential Compression and The Effective Area ofDiaphragms in the Selected Design Topics section for additional information.Due to the wide variety of options,please contact Simrit for dimensionaldetails on double taper diaphragmsFigure 7 – A Typical Double Taper DiaphragmAlternate Diaphragm ConstructionsAll formed diaphragm styles can be made with or without: Fabric Added Sealing Features Gasketing Inserts, and CladdingEach of these options are further detailed in the next section, Selected Design Topics.© Copyright FNGP 200924
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 22 and 23: Convoluted Style - Figure 3:This fo
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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