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Concerns: QEV And Blowgun

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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Concerns: QEV And Blowgun

Unread postAuthor: sagthegreat » Thu May 17, 2012 7:31 pm

I am on a limited budget for my first major project to be posted on the fourms, my budget is $25 for the 1/2 inch QEV and the blowgun

Concerns:

How much pressure do the cheap ebay QEV's take?
What about the pressure on the cheapo blowguns.

**im planning to go to 250-300 PSI**


As usual thanks a lot guys for the support throughout the planning of my project. :D
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Unread postAuthor: mattyzip77 » Thu May 17, 2012 7:33 pm

I have taken a 3/4 inch qev and a chepo depot blow gun to 300 psi with no problems.
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Unread postAuthor: sagthegreat » Thu May 17, 2012 7:36 pm

I was thinking about using a Mcmaster Blowgun
and one of these qevs:

http://www.amazon.com/Amico-Thread-Sock ... acleint-20


or

http://www.amazon.com/Amico-Inlet-Outle ... acleint-20
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Unread postAuthor: mattyzip77 » Thu May 17, 2012 7:40 pm

If you are ordering the blowgun from mcmasters, than I suggest you get your qev from them as well. They are a few bucks more, but in my opinion a much better valve. However, if you must go with one that you listed, I would go with the first one..

Look here:::



http://www.mcmaster.com/#exhaust-control-valves/=hkw5io
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Unread postAuthor: Lockednloaded » Thu May 17, 2012 7:46 pm

If you're buying the eBay QEV (which I reccomend over any other valve of that size) you should also think about ordering a cheap slide valve to give you the option of semi automatic fire in the future. About the same price as a blowgun, with an extra feature.
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Unread postAuthor: jackssmirkingrevenge » Thu May 17, 2012 10:03 pm

Lockednloaded wrote:If you're buying the eBay QEV (which I reccomend over any other valve of that size) you should also think about ordering a cheap slide valve to give you the option of semi automatic fire in the future.


Unsurprisingly, I concur. Though I don't know if eBay slide valves can take 300 psi without leaking, unless you go for the paintball ones.
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Unread postAuthor: jhalek90 » Fri May 18, 2012 12:39 pm

Unsurprisingly, I concur. Though I don't know if eBay slide valves can take 300 psi without leaking, unless you go for the paintball ones.


Not in my experience. I have used one at 200psi, and it developed a small leak. Also starts to get very hard to actuate at anything over 150 psi.

no experience with the paintball type.
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Unread postAuthor: wyz2285 » Fri May 18, 2012 1:29 pm

Have taken my slide valve plus QEV (both from ebay and are the cheapest I could found) to 500 psi, without problems.
Slide valve does give you semi-auto, but remember, they aren´t as confortable to use as a blowgun.
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Unread postAuthor: sagthegreat » Fri May 18, 2012 4:21 pm

i know how to make the blowgun sem auto, thanks to wyz2285
his idea of semi auto should be used more often, soo simple yet efficiant
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Unread postAuthor: sagthegreat » Fri Jun 08, 2012 2:42 pm

So what pressure do you think a cheap black square style QEV could be taken up too?
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Unread postAuthor: wyz2285 » Fri Jun 08, 2012 3:01 pm

I have used 600psi without problems.
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Unread postAuthor: sagthegreat » Sun Jun 17, 2012 12:45 pm

so if i use the semi auto method such as this, which is a screw in the blowgun to regulate how long it pilots for, will i need a bleed hole in the piston?
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Unread postAuthor: Goats spudz » Sun Jun 17, 2012 4:10 pm

I had a cheap ebay 1/4" Qev and 1/4" Slide valve that i took to 1000 Psi and managed to fire it without problems apart from the occasional leak, they work fine under 700 Psi.
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Unread postAuthor: sagthegreat » Mon Jun 18, 2012 5:19 pm

I finally got my qev! gun will be posted soon.

Some concerns: for multishot will i need a bleed hole, also when i blow into the pilot hole, air doesn't come out of the chamber hole? My qev wont even come apart(believe me i tried). thanks guys for the help
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Unread postAuthor: mattyzip77 » Mon Jun 18, 2012 5:32 pm

Why do people always try to give their cannons oral??? Seriously wtf is wrong with people????
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