Diaphragm Design Manual - Simrit

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Figure 19 – Typical Sealing Bead StylesFigure 20 – Alternate (Non-bead) - Flange Sealing StylesFigure 20 offers some additional flange sealing options if a bead is not desired or required. Still other“bead” or flange sealing styles can be made depending on overall design, construction and application ofthe diaphragm. Please consult with the Simrit Engineering Department for further details.© Copyright FNGP 200941
Bead Groove Design:Regardless of shape, to affect a proper seal the bead requires a correctly sizedcorresponding receiver, often referred to as a bead groove, in the assembly hardware.The bead groove must not only be positioned properly it must also make provision forthe displacement of the elastomer during assembly compression.Beads should fit snugly against the inner wall of the bead groove. Rubber does notchange in volume and flows when compressed assuming the shape of the bead groove.Designing the diaphragm’s bead to fit against the inner bead groove wall will help incentering the diaphragm during assembly and remove the possibility of interference fromany OD flash.The rubber must be contained within the groove and not allowed to extrude into theworking area. There might be a concern that the diaphragm will pull out under theseconditions; it is highly unlikely if the diaphragm is not pulled taut. A clearance must bemaintained between the groove lip and the diaphragm allowing the pressure to assist insealing around the bead.Figure 21 and Table 16 offer some guidelines for sizing a proper bead groove fortypical applications. Please note the use of the positive stop to control the beadcompression. For custom applications, contact the Simrit’ Engineering Group forguidance.DIAPHRAGMWPOSITIVE STOP FORCONTROLLEDSQUEEZE.002 "NON-CRUSH" GAPAT FULL CLOSEHFLASH= THE PORTION OF THE BEADTHAT FILLS THE GROOVE VOIDFigure 21 – Bead Groove Sealing Issues© Copyright FNGP 200942
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 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 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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