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any one got ideas on valves

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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any one got ideas on valves

Unread postAuthor: ozzioutlaw » Sat Sep 29, 2012 6:30 am

Hey guys any one got any ideas on a high pressure valve for my new 800 psi rifle
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Unread postAuthor: Goats spudz » Sat Sep 29, 2012 1:05 pm

a Hammer valve.
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Unread postAuthor: doomburger » Sat Sep 29, 2012 1:13 pm

Ball valve, butterfly valve, burst disk, piston valve, etc.
I would suggest the burst disk as it is full flow and opens pretty much instantly, which gives great performance.
Take a look in the wiki for how to make a triggered burst disk.

BTW, how are you pumping to 800 psi??? I would recommend just building a hybrid to achieve the pressures you're trying to get
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Unread postAuthor: Goats spudz » Sat Sep 29, 2012 2:29 pm

doomburger wrote:BTW, how are you pumping to 800 psi??? I would recommend just building a hybrid to achieve the pressures you're trying to get
Thats nothing! why would you need a hybrid, i can achive those pressures in a matter of seconds.
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Unread postAuthor: MrCrowley » Sat Sep 29, 2012 4:34 pm

Goats spudz wrote:why would you need a hybrid, i can achive those pressures in a matter of seconds.
But it's not you who we're talking about, it's the OP get 800PSI? I assume you're getting it from a HPA source like a large CO2/Nitrogen/Helium/SCUBA tank; which are pretty expensive. Hybrids can also be more portable since you only need a small track pump and a little bottle of fuel.

On the other hand, if the OP wants a semi-realistically looking "rifle" to plink with, a pneumatic would be better than a hybrid. I only say that because it's a lot easier to increase the RPM in a pneumatic than a hybrid and if you want raw power, you're not going to waste money on making the cannon look like a rifle.
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Unread postAuthor: Goats spudz » Sat Sep 29, 2012 7:23 pm

Fridge compressor.
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Unread postAuthor: Crna Legija » Sat Sep 29, 2012 8:39 pm

get a QEV of ebay they aren't rated for 800 but will take it quite well and if anything was to break it would be the rubber piston.
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Unread postAuthor: ozzioutlaw » Sat Sep 29, 2012 8:49 pm

Yeah I tried to make one but had no luck their its on air so ill give it ago
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Unread postAuthor: ozzioutlaw » Sat Sep 29, 2012 8:50 pm

Does any one know what sort of fittings I should use for that kinda pressure ( to fill up the cylinder on my gun)
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Unread postAuthor: doomburger » Sat Sep 29, 2012 10:35 pm

I would say steel pipes and fittings. Stainless steel or galvanized steel. They take a lot of pressure, but can be pretty expensive. You can buy them from mcmaster.com

Edit: Also, please don't double post. You can edit your last post to put in any more information.
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Unread postAuthor: Gippeto » Sat Sep 29, 2012 10:38 pm

ozzioutlaw wrote:Does any one know what sort of fittings I should use for that kinda pressure ( to fill up the cylinder on my gun)


Get fittings from a hydraulics shop....don't mess around.

x2 on hammer valve. Even if you build a "piston" valve as the main valve, finding an affordable pilot valve with a suitable rating will be impossible...and you'll end up using a hammer valve for that anyway.
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Unread postAuthor: ozzioutlaw » Sat Sep 29, 2012 11:38 pm

Cool thanks for ya help guys ill be uploading images in a few day asoon as I go online and order everything
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