Concerns: QEV And Blowgun

[sagthegreat]

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.

[mattyzip77]

I have taken a 3/4 inch qev and a chepo depot blow gun to 300 psi with no problems.

[sagthegreat]

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




or

[mattyzip77]

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

[Lockednloaded]

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.

[jackssmirkingrevenge]

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.

[jhalek90]

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.

[wyz2285]

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.

[sagthegreat]

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

[sagthegreat]

So what pressure do you think a cheap black square style QEV could be taken up too?

[wyz2285]

I have used 600psi without problems.

[sagthegreat]

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?

[Goats spudz]

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.

[sagthegreat]

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

[mattyzip77]

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