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Soda stream spud gun project

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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Soda stream spud gun project

Unread postAuthor: AircannonSweden » Mon Nov 14, 2011 3:10 am

I think i will build one something like this:

http://imageshack.us/f/141/fdkjwfkef.jpg/

Pics when its done come soon. I just need a coupler from "R15"-"R8" for the soda stream tank :)
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Unread postAuthor: cannon monkey » Mon Nov 14, 2011 5:07 am

umm ok :)
.....
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most big random like i ever seen

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Unread postAuthor: jackssmirkingrevenge » Mon Nov 14, 2011 5:25 am

why use a ball valve when you can get a quick exhaust valvefor less than $10 posted?
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Unread postAuthor: AircannonSweden » Mon Nov 14, 2011 6:41 am

jackssmirkingrevenge wrote:why use a ball valve when you can get a quick exhaust valvefor less than $10 posted?


Yes i want a QEV but i live i Sweden so...naaaa,the shipping is kinda expensive :/
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Unread postAuthor: jackssmirkingrevenge » Mon Nov 14, 2011 6:49 am

AircannonSweden wrote:Yes i want a QEV but i live i Sweden so...naaaa,the shipping is kinda expensive :/


eBay wrote:Shipping: $0.50 Standard Int'l Shipping


Image
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Unread postAuthor: Mr.michael.2468 » Mon Nov 14, 2011 8:04 am

haha i love that, jut wondering, how do you trigger that valve?

what's this valve rated for?and does it fit standard copper and brass fittings? its all measured in metric so im not really sure... im really interested in it now because its so much cleaner then a big bulky sprinkler valve
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Unread postAuthor: Crna Legija » Mon Nov 14, 2011 8:25 am

Mr.michael.2468 wrote:haha i love that, jut wondering, how do you trigger that valve?


you need a another valve in the Pilot side to trigger it just like any piston/diaphragm valve.

Mr.michael.2468 wrote:what's this valve rated for?


0-0.8 kgf/cm2

Mr.michael.2468 wrote:does it fit standard copper and brass fittings


sure does. if you live in a sane country
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Unread postAuthor: Mr.michael.2468 » Mon Nov 14, 2011 8:45 am

umm i looked up a unit converter, it only handles 11.35 psi... and is there like a page on how these work? i guess i'm not really understanding how this thing is functioning in the first place.
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Unread postAuthor: AircannonSweden » Mon Nov 14, 2011 8:57 am

jackssmirkingrevenge wrote:
AircannonSweden wrote:Yes i want a QEV but i live i Sweden so...naaaa,the shipping is kinda expensive :/


eBay wrote:Shipping: $0.50 Standard Int'l Shipping


Image


Ohhh i didn't know the shipping was so little :o
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Unread postAuthor: jackssmirkingrevenge » Mon Nov 14, 2011 9:02 am

Mr.michael.2468 wrote:umm i looked up a unit converter, it only handles 11.35 psi... and is there like a page on how these work? i guess i'm not really understanding how this thing is functioning in the first place.


Must be a typo, that sort of valve should handle at least 300 psi comfortably without failure.

I'm thinking I should buy a couple to try them out for myself.
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Unread postAuthor: Mr.michael.2468 » Mon Nov 14, 2011 9:06 am

sounds good, and i looked at the picture again and noticed the hole on top for piloting it, that makes more sense lol so is do these valves have a high flow rate then a sprinkler about the same diameter? and do the close up real fast for say, semi auto fire off a high pressure air tank (propane tank)?

oh and you can get them in bigger diameter the last number on the name denotes a size, this one has a smaller input/output hole then the other, im not sure which is which but you get the idea
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Unread postAuthor: mobile chernobyl » Mon Nov 14, 2011 9:29 am

Here's a 3/4" QEV for $8 shipped! Great find JSR - this guy has a stock pile of relatively cheap pneumatic DCV stuff!

http://www.ebay.com/itm/Black-Gold-Tone ... 3f0f673e72
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Unread postAuthor: microman171 » Mon Nov 14, 2011 5:29 pm

Are you not at all worried about the 11PSI rating on the valve..?

There are other QEV on eBay, but to get one with a useable rating you have to pay more. They don't come in that awesome black package either...

@AircannonSweeden: You could make a semi auto gun with a sodastream tank. Using a QEV and a 3 way valve, you can have the sodastream bottle empty into another chamber on one stroke, and then pilot the QEV on the other. Been done before, but I think it's pretty cool...
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Unread postAuthor: jackssmirkingrevenge » Mon Nov 14, 2011 5:32 pm

microman171 wrote:Are you not at all worried about the 11PSI rating on the valve..


A plastic soda bottle will happily take 100 psi without coming close to failing, I find it very hard to believe that an all metal QEV will fail above 11 psi ;)
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Unread postAuthor: cacob_jlarke » Wed Nov 16, 2011 1:49 am

what is the the thread size on an australian soda stream tank? is it 3/8"
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