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good/bad 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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good/bad valve

Unread postAuthor: eriko1337 » Sat Feb 06, 2010 12:23 pm

hey guys, iv been shopping some parts for my new project it was supposed to shoot marbles until i found this valve (see picture). as you see it has pretty small holes for air to go trough and im not sure it can hold ~230psi.

so the questions are: u think it will have enough air flow for a 1cm inside diameter pipe and u think it can hold the pressure?
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Unread postAuthor: MRR » Sat Feb 06, 2010 12:31 pm

Hard to say when there are NO pictures.

Edit: Oh there it is.
Do want to use it as the main valve?
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Last edited by MRR on Sat Feb 06, 2010 12:33 pm, edited 1 time in total.

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Unread postAuthor: jackssmirkingrevenge » Sat Feb 06, 2010 12:31 pm

It should hold 230 psi but as to flow, I think 10mm is pushing the limit for decent power unless you have a very long barrel.
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Unread postAuthor: eriko1337 » Sat Feb 06, 2010 12:35 pm

@ mrr sorry with the pic had to cut it down but now its there.

@jack ye i might get a smaller barrel or just stick to my plans and fire marbles with other valve :wink:

@ MRR again yes i wanna use it as main valve

Edited by jrrdw.
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Unread postAuthor: jackssmirkingrevenge » Sat Feb 06, 2010 12:47 pm

Have a look here for an idea of performance with a similar valve and a 6mm barrel at 110 psi
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Unread postAuthor: eriko1337 » Sat Feb 06, 2010 1:01 pm

wow thts pretty cool, can u shoot darts and stuff with it?
still considering replacing with another valve
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Unread postAuthor: jackssmirkingrevenge » Sat Feb 06, 2010 1:05 pm

You can shoot whatever fits in the barrel ;)

Have a look at this project, it uses a similar blowgun as the main valve for a high pressure pistol type launcher.
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Unread postAuthor: eriko1337 » Sat Feb 06, 2010 1:31 pm

i dont think such small pipes are avalible in sweden

oh and i wanted to make it more rifle like with long range so well see if i keep the valve or replace

Edited by jrrdw.
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Unread postAuthor: MRR » Sat Feb 06, 2010 1:40 pm

I agree with jsr that these kind of valves have bad flow and are more suited for small calibers.

My first tries in this hobby involved a "mouth" blowgun, some needle darts and a shop compressor. The results were definitely superior to lung power. For a little plinking they are good enough.
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Unread postAuthor: jackssmirkingrevenge » Sat Feb 06, 2010 1:49 pm

If you mod your blowgun for better flow and use high pressures (200-300 psi with a shock pump) in a rifle sized package, performance should be pretty decent with a 10mm barrel. If you want extremely good power though you should consider forking out for a Quick Exhaust Valve.
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Unread postAuthor: eriko1337 » Sat Feb 06, 2010 2:23 pm

ok iv been looking around now and that small pipes are not avalible in sweden so i gotta stick to plans and get a small ball valve and make a spring powered trigger for it

thx very much for all great help and answers =) ill post sketch of it soon, and thx again for all help

Edited by jrrdw.
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Unread postAuthor: maverik94 » Sat Feb 06, 2010 3:09 pm

I have used a blowgun to shoot .31 cal. (aprox 8mm) pellets as the main valve, and it was decently powerful, but nothing to scream about. It went through only one side of a pop can filled with water at 200 psi.
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Unread postAuthor: eriko1337 » Sat Feb 06, 2010 3:14 pm

ok it would have been pretty cool with such small air gun but as i said above i cant get the pipe of 6mm in swe :/ are such small good for long range target shooting btw?
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Unread postAuthor: jackssmirkingrevenge » Sat Feb 06, 2010 3:18 pm

What do you mean by "long range target shooting", how big is the target and at what range?

A small forum etiquette side note, there is no need to double post. If you have something more to add to your last post simply edit it instead of posting again.
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Unread postAuthor: eriko1337 » Sat Feb 06, 2010 3:20 pm

like 15-20 meters or so

yes sorry forgot bout that :P
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