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What is the best type of rubber to make a piston valve?

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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What is the best type of rubber to make a piston valve?

Unread postAuthor: THEMOST » Mon Nov 13, 2006 8:23 pm

I'll be making a gun that uses about 100-150psi what is the best type of rubber to use? (fyi: I want to make one of the pistons with the screw through the rubber) I wont be able to repair it as It will be sealed and It uses a 3/4" pvc barrel (sch 40). Thanks :D
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Unread postAuthor: PVC Arsenal 17 » Mon Nov 13, 2006 8:34 pm

I know that rubber pipe caps are real thick and probably will work good

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Unread postAuthor: SpudStuff » Mon Nov 13, 2006 8:55 pm

If you cut out a perfect circle it works as a piston it's self. You can get thoes in the ABS section.
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Unread postAuthor: PVC Arsenal 17 » Mon Nov 13, 2006 9:01 pm

Yeah find something metal that's the diameter you need like a copper coupling and sharpen it up then punch out the cap with a mallet.
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Unread postAuthor: SpudStuff » Mon Nov 13, 2006 9:11 pm

A sharpened steel pipe makes uber sweet pistons!
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Unread postAuthor: Infernal2 » Mon Nov 13, 2006 9:53 pm

Or, if you have access to a drill press you can use a circle cutter and make great circles.
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Unread postAuthor: SpudStuff » Mon Nov 13, 2006 10:20 pm

And destroy the edge of the rubber!
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Unread postAuthor: mark.f » Mon Nov 13, 2006 11:29 pm

Or... you can just get a gasket cutter!

Anyways, that's not the point. He asked what type of rubber, and we're sitting around here yelling about different ways to cut it.

I suggest neoprene, of a relatively harder composition that the stuff you see at the hardware store. I've still got a bit left of my first 4x36" piece of 70A shore durometer neoprene, and I use it all the time for random sealing jobs. Keeps air back at 150 PSI in my copper gun... should work for you.
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Unread postAuthor: sgort87 » Mon Nov 13, 2006 11:42 pm

Personally, I'm a big fan of 30A.
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Unread postAuthor: squeaks » Mon Nov 13, 2006 11:43 pm

Just a question, how thick should it be approximately(metric and imperial please)
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Unread postAuthor: mark.f » Tue Nov 14, 2006 6:37 am

I like 1/8" or about ~3.2mm thick.

I would try 30A, and actually I've had incidences with the 70A where it had to seal against an uneven sealing face, (a small marble coaxial), and I thought to myself, <I>this would be easier if the neoprene was softer</I>. But, with a little work smoothing the surface, or even just stepping up the pressure to around 150 PSI, you get it to seal. I probably should order some 30A, (well, maybe a little stiffer than that), with the parts I gotta order in a few weeks or so for my hybrid.
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