What is the best type of rubber to make a piston valve?
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
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PVC Arsenal 17
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I know that rubber pipe caps are real thick and probably will work good
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PVC Arsenal 17
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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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mark.f
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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.
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.
Personally, I'm a big fan of 30A.
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mark.f
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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.
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.