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diaphragm seal
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Diaphragm Formulas and Definition of Terms
Glossary of Terms
HsMaximum Half Stroke: The maximum distance the diaphragm travels in either direction
from the clamping flange. The total stroke capability is twice the half-stroke capability.
BcCylinder Bore: The inside diameter of the housing with which the diaphragm will be in
contact.
DpPiston Diameter: The outside diameter of the moving component with which the diaphragm
is in contact.
HdDiaphragm Height: The overall height of the diaphragm in the as-molded shape.
WcConvolution Width: The width of the gap created by the difference in the piston diameter
and cylinder bore diameter.
RpPiston Radius: The radius on the diaphragm where it contacts the piston radius.
RfFlange Radius: The radius on the diaphragm where it contacts the hardware flange.
TfTolerance Factor: Diaphragm calculated height +2%.
SfStrength Factor: The average tensile strength of the fabric divided by two.
FtFlange Thickness: Cross section of a diaphragms outer diameter that is clamped or retained
by the hardware.
RPP Corporation 12 Ballard Way Lawrence, MA 01843 USA www.rppcorp.com TIPS-02
Rolling (Top-Hat) Diaphragm Formula for Height:Height = Hs + 1.57 Wc + Rp + Rf +Ft + Tf
Pre-Convoluted Diaphragm Formula for Height:Height = 0.5 (Hs + Wc + Rp + Rf + 2Ft)
Formula for Diaphragm Effective Area:
Effective Area = 0.785 (Bc + Dp)
2
2
Formula for Hardware Piston Skirt Length:
Piston Skirt =
*When Hs is in the direction with the diaphragm rolling onto the piston
(Hd + Hs*)
2
Formula for Diaphragm Working Pressure Capability:
Working Pressure =
Height
Effective Area
Height
Piston Skirt
Working Pressure
Sf
Wc
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