Diaphragm Design Manual - Simrit

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Simrit leads the industry in the design, testing, and production of dynamic seals, whetherthey are homogeneous, fabric-reinforced, or insert molded. Simrit supplies high quality productinto the Small Engine, Automotive, Irrigation, Gaseous Fuels Regulation and other markets andhas worked diligently to develop the elastomers required to meet these industry’s regulatorybodies (e.g. UL, NSF, FDA, etc.)We are particularly adept at working alongside the design team at the prototype stage and usingSimrit’s quality and manufacturing systems, which are certified to ISO 9002 and QS 9000, youcan be assured that your design will result in a highly reliable production product.Using Simrit’s in-house diaphragm testing lab, our engineers can validate the design before,during, and after production has begun to continually improve the product. Each piece of testingequipment is built around a specific customer application to provide results that are easy tointerpret and immediately beneficial to our customer’s engineers. From life cycle testing tofailure mode analysis our engineering team can meet your challenge.Simrit’s production area uses the latest in manufacturing techniques to turn the designs into aproduction reality with a standard industry-leading lead-time of two weeks. Simrit supports avariety of inventory methods and customer order practices to make the decision to manufactureyour product with Simrit an easy one.The Simrit Team
Table of ContentsPageList of Tables, Figures, and Formulas 5Introduction 7Design Guideline – Initial Design ConsiderationsA “Quick Start” Design Check List 8Materials 10Elastomers 11General Purpose Elastomers - Oil ResistantEpichlorohydrin (ECO)Neoprene (CR)Nitrile (NBR or Buna-N)General Purpose Elastomers - Non-Oil ResistantButyl (IIR)Ethylene Propylene (EP or EPDM)Specialty ElastomersEthylene-acrylic (EA)Fluorosilicone (FVQM or FSI)Fluorocarbon (FKM)Polyacrylate (ACM)Silicone (VQM or SI)Fabrics 14General Purpose FabricsCottonNylon and PolyesterSpecialty FabricsFiberglassNomex TM and Kevlar TMOther Fabric TypesDiaphragm Styles 16Diaphragm Construction Styles 17One Side Coated ConstructionTwo Side Coated ConstructionFlat Diaphragms 18Design Guideline – Flat Diaphragm Stroke LimitsBlousingThe Trampoline SyndromeFlat Diaphragm – Closing CommentsFormed Diaphragms 19Design Guideline – Min Convolution Width for One Side Coated Parts© Copyright FNGP 20092
Page 1: Diaphragm Design ManualFreudenberg
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 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
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Diaphragm Design ManualFreudenberg
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Diaphragm Design Manual - Simrit

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