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Old 30th Aug 2021, 5:46 pm   #1
stuart_morgan_64
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Default Making air compressor diaphragm.

I need to make a replacement diaphragm for a Devilblis Tuffy compressor. Any advise on the best rubber to use, or possible link to a seller. It's about 6" and advice please.
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Old 30th Aug 2021, 6:23 pm   #2
Joe_Lorenz
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Default Re: Making compressor diaphragm

Hello,

well about 25 years ago I did some maintenance on similar compressors. That diaphragm looks very much like that one used here:

https://www.pft24.de/luftkompressor-...250-handy.html

I know these compressors are still being made, about 3 bar max pressure. They sell spare parts, listed below. Maybe you can ask for the dimensions to find out if the diaphragm would fit.

Regards, Joe
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Old 30th Aug 2021, 6:49 pm   #3
Leon Crampin
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Default Re: Making compressor diaphragm

Butyl rubber pond liner is very durable, but might be slightly thick if great flexibility is needed.

Leon.
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Old 30th Aug 2021, 6:50 pm   #4
stuart_morgan_64
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Default Re: Making compressor diaphragm

I have seen that mentioned as a material to use,
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Old 30th Aug 2021, 10:22 pm   #5
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Default Re: Making compressor diaphragm

I think that EPDM might be my first choice.

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Old 30th Aug 2021, 11:55 pm   #6
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Default Re: Making compressor diaphragm

At that pressure, it will be a fabric/elastomer multilayer composite.

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Old 31st Aug 2021, 11:44 am   #7
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Default Re: Making compressor diaphragm

Quote:
Originally Posted by Radio Wrangler View Post
At that pressure, it will be a fabric/elastomer multilayer composite.

David
3bar is mentioned above is that right? I note the one in the picture is not just a flat sheet; it has structure. Maybe flat simple sheet rubber would work at least for a limited time, and might keep you going till you find something better?
This forum is probably not the best place for expertise on such matters.
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Old 31st Aug 2021, 12:49 pm   #8
stuart_morgan_64
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Default Re: Making air compressor diaphragm.

Not sure the total pressure sure it used to cut out around 60 or so psi. The shaped.bit is concerning me a bit. It seems to be just rubber not a composite material.
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Old 31st Aug 2021, 1:21 pm   #9
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Default Re: Making air compressor diaphragm.

I think that every type of diaphragm I've ever seen has structure; re-enforcing ribs or rings of some kind, it's probably an easy way or making less rubber do more, and easy to do when designing a mould. I saw some 22" diameter hemispherical diaphragms which were surprisingly thin in the centre, but had radial ribs, these being used in a type of accumulator.
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