Whats the right material to make a compressor valve pestel?

[Philip AParticipant @philipa30666]

Hi, one of my compressors requires a replacement valve pestel, thats the spring loaded often coin shaped piece of plastic that seals the valve when air tries travelling in the wrong direction. The cos of the pestel is more than the cost of the entire new valve! Now that I have a mini lathe I thought I could make a pestel but I'd need to know the right material to use. Cheap compressors use some sort of nylon/plastic but the better ones have some sort of rubberised plastic.

[Philip AParticipant @philipa30666]

[Brian MorehenParticipant @brianmorehen85290]

Pestel is a new product name i have not heard off . Pressure valve that i have used have a O ring in the seat that can be replaced when they leak your valve sounds like a non return valve ? I have repaired a automatic pressure switch with a small piece of fine rubber sheet which is still working . If you have any more info I bet some one will have some info.

Regards Bee.M

[Oily RagParticipant @oilyrag]

I made one out of Nylon 66 with Moly disulphide filler, trade name Nylatron. Has excellent properties and wear resistance.

Refer to this for Nylon grades commonly available, note Nylon 66 is preferable to Nylon 6 due to its higher melting point.

Martin

[Oily RagParticipant @oilyrag]

Sorry – forgot to add the link:-

http://www.craftechind.com/app/uploads/nylon_final.pdf

Martin

[Philip AParticipant @philipa30666]

Posted by Oily Rag on 08/01/2021 13:42:12:

I made one out of Nylon 66 with Moly disulphide filler, trade name Nylatron. Has excellent properties and wear resistance.

Refer to this for Nylon grades commonly available, note Nylon 66 is preferable to Nylon 6 due to its higher melting point.

Martin

Thanks, so did your nylon pestel seal correctly?

[Oily RagParticipant @oilyrag]

Yes – perfectly. The old one had worn and split after it hardened, seemed to be made out of a beige Nylon like material. The replacement has been in there for 4 years now, holds pressure over weeks – unless I leave the blow gun connected in which case it leaks away in about 2 hrs, but that is down to a dodgy 'qwik fit'.

Martin

[Philip AParticipant @philipa30666]

Posted by Oily Rag on 08/01/2021 18:31:39:

Yes – perfectly. The old one had worn and split after it hardened, seemed to be made out of a beige Nylon like material. The replacement has been in there for 4 years now, holds pressure over weeks – unless I leave the blow gun connected in which case it leaks away in about 2 hrs, but that is down to a dodgy 'qwik fit'.

Martin

Fab Martin, I'll be doing that then. This lathe is well on it's way to paying for itself!

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