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Advanced pneumatic question

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Advanced pneumatic question

Unread postAuthor: Brian the brain » Mon Feb 27, 2006 3:16 pm

I would like to try and set a new pressure standard on homebuilt pneumatics.I'll soon get my CO2 bottle .I plan to build a strafer (cal depending on available bb's up to 9mm) off a CO2 bottle (500 gr).I have some idea on how to make a pressure proof valve but I'd like to know if anybody knows a valve I could use at these pressures.( I thought about a thick steel T with a sliding pipe inside exposing a hole when slid)
I'm not concerned about the number of shots. 50 before it empties is a lot when you consider every shot is lethal.

My other question: If this idea proves to tricky, could I make a piston valve at 60 bar(900 psi) that pilots through a regulator, to keep the excaust valve under less pressure?

No dumb comments like "don't use pvc" please, I'm not an idiot.I'll only use heavy steel components.I don't care if it takes me a year to find them.
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high pressure valve.JPG
I've already built this valve once for lower pressure purposes.Very little friction when lubricated. Totally airtight.(It's not particularly fast but might be when it's spring released)
Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: jrrdw » Mon Feb 27, 2006 6:04 pm

You will have to regulate down from 900 psi for sure, if not every soft peice of meterail is gonna fly out your eshaust hole, and if it aint big enough to fit through, it will get bigger in a hurry all on it's own. For your valve idea yea great for normal cannon pressures, but at 900 psi it's gonne leak out where the lube is,(if theres room for lube it's not tight enough). If you can come up with a good blue print of a step type seal,(metal surface to metal surface), 3 or 4 steps, male into female with about .0001 tolarance, and a good machinest to make it, that could probly hold that kind of pressure,(MABY), don't know for sure never built one! Good luck, let us know what you do, i'm interested because of the high pressure.
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Unread postAuthor: Brian the brain » Mon Feb 27, 2006 6:52 pm

THe seal consists of a rubber hose( I was thinking of medical tubing) over a metal pipe.THe pressure pushes the hose onto the pipe and thus it can't leak.

Second...

Wich soft pieces are you talking about??
I'll only use steel components

The hoses aren't going anywhere.There kept in place by the pressure..I think...??Unless it can rupture at the spot where the center pipe slides through the other two..

Well I'll see.Nothing can pop off it'll most likely just start hissing in the event of a leak.That's what the bottle's main valve is for right?I've also just located a local source for .354 round led ball's so the game is on!!

By the way..has anyone checked the links in my signature yet??That girandoni gun kicks...a donkey!!!(edit) I did buy a regulator just in case
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Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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