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Why are there different temperature ratings for the same material diaphragm in the Dia-Flo catalog (Weir vs. Straightway)?

April 26, 2017catalog dia-flo diaphragm different material ratings temperature vs weir

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Why are there different temperature ratings for the same material diaphragm in the Dia-Flo catalog (Weir vs. Straightway)?

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The diaphragm, being a non-metallic material, is the weakest component in the diaphragm valve. The diaphragm’s physical properties will degrade with increasing temperature. The straightway diaphragm must go through a much larger deflection than the weir diaphragm. Therefore, its tolerance on higher temperatures is lower.