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What qev should I get? And a two other questions

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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What qev should I get? And a two other questions

Unread postAuthor: beastmode986 » Mon Apr 09, 2012 3:57 pm

Ok so I want to get a qev for my next project . I want to make changeable bfb barrels so I'm can shoot different kinds of ammo, should I get a 1/4 in , a 3/4 in or a 1/2in , I can use fittings to size down or size up the changeable barrels to fit but I also want a good amount of power and decent efficiency as in 5-10 357 pellets being shot no less than 600 fps from a 12 gram I know I can probably use ggd but I mainly want to know which one of the qevs will give the best efficientcy and power that I want?

My idea for my air source is to use a 1/4 in threaded coupling (I think it's called that ) and screw that into the back of the slide valve or onto depending what kind I get and then screw an Asa onto the other end and screw on a 12 Gram quick changer or a paintball tank will this work?

Can I run my air tanks and co2 unregged? Basically I want to know if I can screw a 12 gram onto the Asa and not need a regulator for an air source alternative to the 12 gram I would use a 13/3000 or a 20co2 tank would the qev not be able to handle the pressure ? Or slide valve?
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Unread postAuthor: warhead052 » Mon Apr 09, 2012 4:03 pm

Buy a European 3/4" QEV for multiple uses. I used one with a 2" barrel and it worked extremely well, and then scaled it down to a 1/8" barrel and it worked decently, not the best, but decent enough for me.

Plus, with a Euro qev, I know for a fact you can run unregged co2 into it.
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Unread postAuthor: beastmode986 » Mon Apr 09, 2012 4:36 pm

Ok thanks! Are they for sale on eBay?
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Unread postAuthor: beastmode986 » Mon Apr 09, 2012 4:38 pm

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Unread postAuthor: Goats spudz » Mon Apr 09, 2012 4:43 pm

Unless your behind kevlar and have a death wish i wouldn't suggest putting unregged co2 or HPA into a qev, if you want to use them kinds of pressures i would suggest a custom piston valve made from stainless steel and a piston made from Acetal. otherwise stick to 500 - 800 psi
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Unread postAuthor: wyz2285 » Mon Apr 09, 2012 4:45 pm

what are you going to shot? 3/4" is too big for rather BB/paintball/pellet.
If you are going to use unregulated co2, a 1/4" will work fine with paintball/BB/.144 or .22pellet.
1/2" will work to, and allows you some space for larger bore. But for a pellet gun, using a 1/2" for me is a overkill
3/4" QEV are for cannons, if you barrel isn´t a large bore, the flow will get restricted a lot also you wast more air by releasing more air/co2 than needed and from piloting it.
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Unread postAuthor: beastmode986 » Mon Apr 09, 2012 4:46 pm

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Unread postAuthor: wyz2285 » Mon Apr 09, 2012 4:48 pm

The non-cube one.
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Unread postAuthor: sagthegreat » Mon Apr 09, 2012 4:50 pm

whats wrong with the cube one?

(thats all i can afford)
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Unread postAuthor: beastmode986 » Mon Apr 09, 2012 4:50 pm

Ok thanks ,mainly I'll shoot paintballs ,50 cal pellets and 357 pellets. So I'll probably get a 1/2 in also what qev should I get? A metal one or the plastic 10$ ones I'm not looking to spend a lot just something that wil work for what I wanna do?
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Unread postAuthor: Goats spudz » Mon Apr 09, 2012 5:34 pm

beastmode986 wrote:Ok thanks ,mainly I'll shoot paintballs ,50 cal pellets and 357 pellets. So I'll probably get a 1/2 in also what qev should I get? A metal one or the plastic 10$ ones I'm not looking to spend a lot just something that wil work for what I wanna do?
my qev was £4 or $6 http://www.technobotsonline.com/pneumatics/valves/quick-exhaust-valves.html
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Unread postAuthor: warhead052 » Mon Apr 09, 2012 5:38 pm

Goats, a qev can handle unregged co2... Ask just about anyone on here who has done it *cough* btb *cough*.

Beast, the second QEV you linked to would work perfectly.
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Unread postAuthor: beastmode986 » Mon Apr 09, 2012 5:52 pm

I was gonna get that one but it's so expensive compared to other ones and goats- the qevs are to small
I think I have a qev in my room I'll pos a pic ASAP so you guys can see if it would work with my project
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Unread postAuthor: Goats spudz » Mon Apr 09, 2012 5:57 pm

warhead052 wrote:Goats, a qev can handle unregged co2... Ask just about anyone on here who has done it *cough* btb *cough*.

Beast, the second QEV you linked to would work perfectly.
i was referring to the square one :D
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Unread postAuthor: beastmode986 » Mon Apr 09, 2012 6:04 pm

Well idk if I can post a pic but it's a stainless steel one I got off of an air compressor if you look at the back there's a nut to the left there's a threaded piece sticking out same on top it looks like 3/4 in on top 1/2 in in front and 1/4 on the left if that's a good enough description
It looks just like this but there's a threaded nipple on the left side
http://www.ebay.com/itm/1-4-qev2-HUMPHR ... _500wt_689
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