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QEV-75M

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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QEV-75M

Unread postAuthor: frocksie » Fri Oct 19, 2007 10:06 pm

I just finished this QEV gun today, and it is really impressive, even more impressive than my first piston valve.

SPECS
valve: 3/4 in QEV from Fastenal
pilot valve: 3/8in ball valve
barrel: 4 ft of 1/2 in copper
chamber: 3 ft of 3/4 in copper
pressure: 100-150 psi

This gun vaporizes potatoes when shot, so marbles are the best ammo.

This was a pretty fun one to build, and it was my first time soldering pipe.
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Attachments
Can devastation.jpg
These are two cans I shot, the one on the left was with a dart, and the the one on the right was with a potato.
pic download 8-18-2007 003.jpg
This is my ghetto bipod
whole gun-ball valve exhaust.jpg
ball valve exhaust.jpg
Last edited by frocksie on Mon Oct 22, 2007 3:46 pm, edited 1 time in total.
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Unread postAuthor: rna_duelers » Fri Oct 19, 2007 10:13 pm

I like, a lot!Nice damage to those cans.

You could shorten the tube going from the blowgun to the valve and get a performance increase.How much was that 3/4 QEV?
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Unread postAuthor: jackssmirkingrevenge » Fri Oct 19, 2007 11:16 pm

rna_duelers wrote:You could shorten the tube going from the blowgun to the valve and get a performance increase.


Or mound the blowgun directly to the QEV and add a trigger on a rod extension.
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Unread postAuthor: MrCrowley » Fri Oct 19, 2007 11:34 pm

Nice cannon, i've always wanted to use copper. Looks like your soldering turned out good as well, nice job.

@JSR and RNA

The pilot volume is reasonably small, the I.D of the pressure hose is only about 5mm, and that 1/4" galv tee is nothing big either. Though he could upgrade the blowgun for better performance.
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Unread postAuthor: spudgunnerwryyyyy » Fri Oct 19, 2007 11:59 pm

His blowgun has a piece of like blue hard foam between the level and the push rod which will make it open more fully, and if you used a 1/4" ball valve for piloting you could take it up to 150psi, the pressure limit for qevs. It would be a bit unwieldy but it would pilot faster and again you could crank the pressure.
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Unread postAuthor: frocksie » Sat Oct 20, 2007 6:44 am

Thanks for the comments.

Has anyone who has used a QEV noticed that when it is opened it makes a ping, similar to the ejection of a clip in an M1 Garand?

Would anyone mind running this gun through GGDT, as it doesn't work on my computer?


I just changed the blowgun to a 3/8in ball valve, and the power increase is crazy. With the ball valve piloting the QEV, I put a nail through a coin.
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ball valve exhaust.jpg
3/8 in ball valve
whole gun-ball valve exhaust.jpg
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Unread postAuthor: origin unknown » Sat Oct 20, 2007 8:57 pm

Nice cannon. I like the can damage. Glad to see someone else uses the Fastenal QEVs too 8).
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Unread postAuthor: frocksie » Sat Oct 20, 2007 9:32 pm

Thanks, Fastenal was the only place I could find QEVs, so I really had no choice, but they do a good job. I ordered my valve and got it a day and a half later, without paying any extra shipping.
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Unread postAuthor: spudgunnerwryyyyy » Sat Oct 20, 2007 10:38 pm

Sweet, so thats great the ball valve helped that much. Did you increase the pressure to 150psi?
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Unread postAuthor: battlemonkey » Sun Oct 21, 2007 12:35 am

is there anywhere you can get QEV's in new zealand? can't seem to find them anywhere. nice gun btw
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Unread postAuthor: hi » Sun Oct 21, 2007 12:44 am

its a cool looking gun, but my recommendation is that you turn the ball valve 90 degrees, that way its like a trigger.

my QEV gun also uses a ball valve for exhaust and trust me, its more comfortable if you turn it 90 degrees. just put a 45 on the nipple and it will do you wonders.
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Unread postAuthor: MrCrowley » Sun Oct 21, 2007 12:54 am

battlemonkey wrote:is there anywhere you can get QEV's in new zealand? can't seem to find them anywhere. nice gun btw


Yeah there is, just the one place I know of, they cost a fair penny though.
<A HREF="http://www.rsnewzealand.com/cgi-bin/bv/rswww/searchBrowseAction.do?Nr=avl%3anz&N=4294762682&name=SiteStandard&forwardingPage=line&R=3896747&callingPage=/jsp/browse/browse.jsp&BV_SessionID=@@@@1248015776.1192945838@@@@&BV_EngineID=cccdaddmflefjdjcefeceeldgondhgm.0&cacheID=nzie">3/4" QEV</a>

If the link doesn't work, go to http://www.rsnewzealand.com and search Pneumatic P4Q quick exhaust valve,G3/4 then look at the first 4 results.

Someone did get one from a hydraulics store, but stock would vary between stores.
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Unread postAuthor: rna_duelers » Sun Oct 21, 2007 3:20 am

I can get them from a number of places,hydraulic places included although they aren't cheap,if they were I'd be using one.
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Unread postAuthor: frocksie » Sun Oct 21, 2007 6:53 am

@spudgunner

yeah, the blowgun couldn't open the QEV fast enough, so the valve was honking. I haven't taken it to 150psi, but I will today.

@hi

I will probably turn the ball valve around today, does it really make that big of a difference?
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Unread postAuthor: origin unknown » Sun Oct 21, 2007 11:42 am

You could mod your blowgun and use that instead of a ball valve.
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