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Corrugations of Diaphragm Pressure Gauge
How corrugations of diaphragm in diaphragm pressure gauge compared to flat diaphragm

I just want to ask how is corrugated diaphragm permit larger elasticity and deflection compared to flat diaphragm and how does its structure protect from overpressure. It's just that I can't get the proper explanation in this one from my sources.

thank you in advance.