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new gun? could this work?

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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new gun? could this work?

Unread postAuthor: pnematicrookie » Wed Feb 06, 2008 10:27 pm

ive new used a qev OR a piston valve before! but im making a barrel sealing valve and i got 2 qev's on the way, and ive been trying to figure out how to incorparate both in one gun...could this work?...oh yeah and could i use a screw-in valve for air input?
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Unread postAuthor: MrCrowley » Wed Feb 06, 2008 10:33 pm

Why?

I don't think you grasp the concept of piston valves very well.

All you are doing with having the QEV there is limiting flow, having more dead space, and wasting $25.

Why would you have a QEV infront of a piston valve?

Oh and when you trigger the piston valve you will be sending alot of air pressure, fast, into the input of a QEV, which wont do it any good, and then all the air will eventually go out the pilot valve from the piston valve and the QEV wont actuate and all your air is gone and nothing has happened. :?

Explain please.
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Last edited by MrCrowley on Wed Feb 06, 2008 10:39 pm, edited 1 time in total.
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Unread postAuthor: pnematicrookie » Wed Feb 06, 2008 10:34 pm

sorry :cry: im just trying to learn.....
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Unread postAuthor: Hailfire753 » Wed Feb 06, 2008 10:35 pm

No. I don't think it would. In a QEV the pilot pressure has to decrease to be less than the chamber pressure, and in this design they would decrease at the same rate. Just don't attach the chamber to the pilot.

There is a great picture and description of how a QEV works in the Wiki link at the top of the page. However, the wiki is currently down, so wit a bit, then search "QEV" there.

Edit: MrCrowly, there is no piston valve in his design. There is a QEV, and a barrel.

Also, search for QEV cannons in the search link below the "cannons" button, or just browse pneumatics.
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Last edited by Hailfire753 on Wed Feb 06, 2008 10:39 pm, edited 2 times in total.
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Unread postAuthor: DYI » Wed Feb 06, 2008 10:37 pm

It seems to me like you're just trying to incorporate excess parts :wink:

Using the QEV to pilot a larger piston valve is the only way that you're going to use both in one simple design.
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Unread postAuthor: pnematicrookie » Wed Feb 06, 2008 10:41 pm

thanx, good thing i asked about it first lol
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Unread postAuthor: MrCrowley » Wed Feb 06, 2008 10:42 pm

Hailfire753 wrote:No. I don't think it would. In a QEV the pilot pressure has to decrease to be less than the chamber pressure, and in this design they would decrease at the same rate. Just don't attach the chamber to the pilot.

There is a great picture and description of how a QEV works in the Wiki link at the top of the page. However, the wiki is currently down, so wit a bit, then search "QEV" there.

Edit: MrCrowly, there is no piston valve in his design. There is a QEV, and a barrel.

Also, search for QEV cannons in the search link below the "cannons" button, or just browse pneumatics.


Ah yes there is, notice the words saying "2" barrel sealing tee".

And he said he was incorperating a piston valve and QEV into his design.
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Unread postAuthor: Hailfire753 » Wed Feb 06, 2008 10:45 pm

Lol,Whoops, sorry MC. It's late over here and i'm half awake. I unviewed the pic, and did not see remember that.
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Unread postAuthor: MrCrowley » Wed Feb 06, 2008 10:48 pm

Hailfire753 wrote:Lol,Whoops, sorry MC. It's late over here and i'm half awake. I unviewed the pic, and did not see remember that.

I had a feeling... :)

Edit: MC, haha Master of Ceremonies. :D
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Unread postAuthor: pnematicrookie » Wed Feb 06, 2008 11:19 pm

well, i went back to the drawing bored and i think ive made some good corrections :wink: just wait a few weeks
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Unread postAuthor: psycix » Thu Feb 07, 2008 8:31 am

pnematicrookie wrote:well, i went back to the drawing bored and i think ive made some good corrections :wink: just wait a few weeks

Do you think its boring to design guns? :?
:D
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Unread postAuthor: pnematicrookie » Fri Feb 08, 2008 10:38 pm

lol, i meant BOARD
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Unread postAuthor: peeeto » Sat Feb 09, 2008 10:15 pm

keep it up! - we can see you're really trying to learn.

p.s. lol i just have to ask (j/k here) - did you name the JPG "newdesign_137"? and if so, that wasn't your 137th sketch, was it?! ;) it occurred to me that if so, that's dedication!

[edit, added:]
p.p.s. where have you used qev's before? paintball?

p.p.p.s. i don't think it's an problem 'cause you're obviously new to alot of this, but i think this discussion area, "Pneumatic Cannon Showcase", is for generally for constructed projects... questions are better off posted in the "Pnaumatic Cannon Discussion" area... not tryin' to tell you what to do, 'cause i'm new here too, just trying to help.
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Unread postAuthor: pnematicrookie » Tue Feb 12, 2008 8:44 am

to peeeto, lol, no thats not my 137th sketch, i really dont know how that came to be...but yeah i pretty much kno not to post these type of posts here...ive been gettin' harassed a lot about it, and thanx for the positive message...idk why people think u just suppose to know this stuff naturally
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Unread postAuthor: MaxuS the 2nd » Tue Feb 12, 2008 9:25 am

but yeah i pretty much kno not to post these type of posts here...ive been gettin' harassed a lot about it, and thanx for the positive message


Only because you have been too lazy to properly research before you post.
If you were to research first, then we'd be happy to help.
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