Diaphragm Design Manual - Simrit

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. UL.c. ASTM.d. Internal.e. Other.13. Tolerances – This area is often overlooked but is extremely important. Please review the information and thechart provided on pages 44-46 & Technical Flyer Page 60 before completing your design.Formula 1 – The Diaphragm’s Designed Fabric Tensile Strength – page 15 Convolution Width x Burst Pr essureFabric Tensile ( Design) 2Formula 2 - Blousing Flat Diaphragms for Stroke (reference Figure 1) – page 18 and 19 Bore Diameter Piston Diameter OD Bore Diameter 2 x S 2whereS Half Stroke2 Bore Diameter Piston Diameter 22Formula 3 – Half Stroke for Convoluted Diaphragms – page 21Convoluted Half Stroke 2 x Height Convolution Width 2 xFormula 4 – Height Calculation for Convoluted Diaphragms – page 22Flange Radius1Convoluted Height Convolution Width 2 x Flange RadiusFlange Thickness Half Stroke2Formula 5 – Height Calculation for Deep Draw Diaphragms – page 24Deep Draw HeightFlangeRadius 1.56 ConvWidth Half Stroke Flange Thickness 2. SFFormula 6 – Half Stroke for Deep Draw Diaphragms – page 24FlangeRadius 1.56 ConvWidth Deep Draw Half Stroke Height Flange Thickness 2.Formula 7 – The Diaphragm’s Designed Effective Area – page 292 Piston Diameter CylinderDiameter Effective Area ( Design) x 4Formula 8 – Calculating Sidewall Tension – page 312 2.25 P D2 D 1Lbs.Total Tension(T) D1 of Bore CircumferenceCOSD2 in Where: D 1 = the piston diameter in inches, D 2 = the bore diameter in inches, P = the pressure in PSI, and a = the angle of thesidewall from the vertical. Note: D2 D1 12 Tan where h is h the height ofthe convolution at max strokeFormula 9 – The Diaphragm’s Designed Burst Pressure – page 31 Fabric Tensile x 2 Burst Pr essure ( Design) Convolution Width Formula 10 – The Piston Skirt Length for Best Diaphragm Support – page 34Piston Skirt Length Convolution Height Half 2StrokeSF Cylinder DiameterSafety Factor (SF).25 / .99 1.00 / 2.50 2.51 / 4.00 4.01 and Up0.06 0.10 0.12 0.14© Copyright FNGP 20099
Tables KeyMeaning Excellent Very Good Good Fair PoorLetter A B C D E© Copyright FNGP 200910
Page 1 and 2: Diaphragm Design ManualFreudenberg
Page 3: Table of ContentsPageList of Tables
Page 8 and 9: IntroductionThe elastomeric diaphra
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 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 58 and 59: © Copyright FNGP 200957
Page 60 and 61:
© Copyright FNGP 200959
Page 62 and 63:
Page 64 and 65:
Page 66:
Diaphragm Design ManualFreudenberg
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