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Join Date: Aug 2017
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Corrugations of Diaphragm Pressure Gauge

08/05/2017 12:24 AM

good day,

i just want to ask how is corrugated diaphragm permit larger elasticity and deflection compared to flat diaphragm and how does its structure protects from overpressure its just that i cant get the proper explanation in this one from my sources

thank you in advance

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#1

Re: corrugations of diaphragm pressure gauge

08/05/2017 12:49 AM

For questions of a general nature, your text book should be your first choice.

Then, you should ask a search engine.

Diaphragm Pressure Transducer-Working, Types, Capsules...

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#2
In reply to #1

Re: corrugations of diaphragm pressure gauge

08/05/2017 1:15 AM

Corrugated diaphragms permit considerably larger deflections than flat diaphragms because the corrugations increase the effect length of gauge element.

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#3

Re: corrugations of diaphragm pressure gauge

08/05/2017 2:15 AM

It's pretty easy to push an accordion bellows a few inches to one side, but not so easy to push a violin string that far.

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#4

Re: corrugations of diaphragm pressure gauge

08/05/2017 4:07 AM

..."Diaphragm elements basically possess a corrugated profile. A smooth metal diaphragm would deform plastically under loading and would therefore make a precise pressure measurement impossible."...

http://www.instrumentation.co.za/8522a

..."Measuring systems with diaphragm elements, on the grounds of their design alone, offer good protection from overpressure, since the diaphragm can support itself against the upper flange. "...

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#5

Re: Corrugations of Diaphragm Pressure Gauge

08/05/2017 10:03 AM

When the diaphragm deflects, the span across it has to increase. The corrugations allow the diaphragm to stretch and thus deflect further.

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#6

Re: Corrugations of Diaphragm Pressure Gauge

08/05/2017 10:46 PM

The corrugations result in a much larger area and effective diameter of sheet metal that is under pressure stress. Such a larger diameter allows a much greater deflection of the center of the diaphragm for a given internal pressure. Stops (rigid "snubbers") are attached to the supporting framework that stop the diaphragm movement beyond a predetermined deflection.

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#7

Re: Corrugations of Diaphragm Pressure Gauge

08/11/2017 8:13 AM

Question has been answered.

So, I will now through in a warning - remember to keep your fingers off the diaphragm - first one we worked with, 25 years ago, when we were first starting to build our equipment with the associated instrumentation, the tubing welder thought it would be fun to depress the thing and watch the little indicator move, and he did. They will permanently deflect if they are pressed vigorously enough.

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