Diaphragm Design Manual - Simrit

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strength, but this strength also makes it difficult to process and hard to cut.Both Nomex TM and Kevlar TM are high performance materials. Price considerations in regard to theoverall application’s cost constraints should be considered before using them.FabricGENERAL CHARACTERISTICS of FABRICSTensileStrengthMoistureResistanceHeatResistanceMaximumOperatingTemperatureCotton D C D 350 o FNylon B B** C 300 o FPolyester C A B 350 o FNomex TM B B A 375/400 o FKevlar TM A B A 375/400 o FFiberglass A A A 500 o F+Notes: "A" is the highest possible rating wihtin a category., Nomex and Kevlar are registered tradmarks of DuPont., **Caution - hot water and steam hydrolyzes nylon.Table 3 – General Characteristics of Fabrics – Reference Key on page 10Other Fabric TypesIn addition to the fabrics listed above, several other fabric types are available for diaphragmreinforcement. They include silk for ultra thin, ultra sensitive diaphragms and non-woven orchopped fabric for reducing pressure or fluid wicking.Formula 1 – The Diaphragm’s Designed Fabric Tensile Strength Convolution Width x Burst Pr essureFabric Tensile ( Design) 2ElastomerGENERAL CHEMICAL RESISTANCE to SOME COMMON CHEMICALSNitrileNeopreneButylSiliconeChemicalAir A A A A A B A A AAlcohols (General) B C B B BAntifreeze A A A B CBrake fluid A BButane A A C B A BCitric acid A C B B C C C C CDiesel oil A A C B A AFruit juice A A A A C B BGasoline, automotive A A B B CHydraulic oil (petro) A B B B C B BNatural gas A A A B C B B B BSalt water A A A A C C B BNote: A blank space means Not Rated or insufficient data available.EthylenepropyleneFluorocarbonPolyacrylateFluorosiliconeEpichlorohydrinEthyleneacrylicTable 4 – Elastomer Resistance to Some Common Chemicals – Reference Key on page 10© Copyright FNGP 200915
Diaphragm StylesDeep Draw with ID and Flange Holes – See page 23Shallow Draw with Beaded Flange – See page 20Convoluted with Flat Flange – See page 21Flat Cut with ID and OD Holes – See page 18Double Taper with Flat Flange – See page 24Drop Center with Piston Hole – See page 22© Copyright FNGP 200916
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 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 66:
Diaphragm Design ManualFreudenberg
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Diaphragm Design Manual - Simrit

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