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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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Unread postAuthor: carl2.0 » Sat Nov 17, 2007 6:22 pm

ok guys cool,... guess its back to the drawing board...
PS Im not living in america soo that 30 saving is actually $60 here soo yeh thats why i went wid the blowgun valve at first.... but if it means super crappy performance ill adjust. Cus I did do a firing test earlier n i was a bit disappointed
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Unread postAuthor: chaos » Sat Nov 17, 2007 6:32 pm

don't forget to check ebay for sprinkler valves, they can be cheaper there if you can find them.

good luck with it all :D
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Unread postAuthor: Hubb » Sat Nov 17, 2007 8:33 pm

You could always just opt out for a ball valve. I'm sure they would be cheaper than your sprinkler, if you don't' find one on ebay. Of course, you may want to add a spring to give better opening times to it.

Another option would be a burst disc valve. The wiki has a pretty neat section on triggering a burst disc, in which you could use your blowgun valve.

In short, don't think you are limited to purchasing a sprinkler valve. It is a choice (and a fine one for your needs) but it is not the only choice.
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Unread postAuthor: DYI » Sat Nov 17, 2007 8:43 pm

Unless you don't mind a rate of fire less than 4 rph (rounds per hour), and building one of the most difficult valves to seal, don't use a triggered burst disk. They sound great, and have loads of flow and opening time, but they aren't practical at all.

Just build a piston valve. With lots of epoxy, they can be built to a decent size very cheaply, less than a sprinkler valve.
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