SpudFiles

I found this website looking for valves for potato guns but I was wondering how they get the pressure of whatever they are using it on up to that pressure? It would be awesome to make a 150,000psi cannon I have no idea what kind of pipe you would use or how to get it that high.http://www.highpressure.com/valves_fitt ... &section=4

Looks like a needle valve for hydraulic pressure.

No gas would be a gas at 150,000psi (without some ridiculous conditions) so it's a no-go.

Also you would be limited by the expansion rate of air.

Such equipment would definitely be hydraulic. I think I remember calculating that blackpowder burns around 150 KPSI, (wasn't that exact number).

At room temperature, hydrogen is the only thing that would still be gaseous at that pressure. Even helium would be liquified. I don't know of any hydraulic or pneumatic systems that operate anywhere near that kind of pressure. Even light gas guns and tank cannons don't usually operate over 100kpsi.

well then with that said can we try at 99kpsi??

Well, you try and build a homemade LGG, and go right ahead. I'm sure we'll hear about it on the news...

I dont think there is any way of getting to that pressure but if you did and fired it would deafen everybody within a mile of the point you fired it.

Not to mention that at 150 kpsi you'd have several kilos of gas being vented, so the recoil would be, to say the least, devastating. Bye-bye rotator cuff.

Well, those numbers depend on the size of chamber you used, and whether you were idiotic enough to fire it handheld. With a small enough chamber, using 150kpsi hydrogen, your performance:size ratio would be higher than any firearm.

Unfortunately, this doesn't change the problem that the valve system on a handheld 150kpsi hydrogen pneumatic would cost more than most people earn in a year.

So just use it on a high powered pneumatic! You don't have to use it at 150kpsi, do you? If not, you could try to make a gun on unregulated nitrogen or something. I mean, it's a pretty much fail safe valve, so what's the problem?

The flow is crap thats what

i no gun powder burns at roughly 50000psi. would it be used for steam?

Hotwired wrote:The flow is crap thats what

Oh... Then screw it...

what do you mean black powder burns at 50,000 psi? like in "in a closed chamber it produces 50,000 psi max?" or that it self ignites at 50,000psi?