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New Idea on pellet rifle

This area is for the discussion of BB or airsoft sub machine guns, and or other small arms such as pellets.
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Unread postAuthor: Chuck » Sat Oct 13, 2007 12:46 pm

windshrike wrote:Chuck, you don't build a QEV, you buy one.

Check the wiki for their operation and Fastenal has them on their website, under the name 'exhaust valves'.
Well where do I buy one
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Unread postAuthor: windshrike » Sat Oct 13, 2007 12:49 pm

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Unread postAuthor: ALIHISGREAT » Sat Oct 13, 2007 1:01 pm

Chuck wrote:
ALIHISGREAT wrote:
Chuck wrote:Well here it is starting to look more and more like a gun now. I decided to make it a pistol. I want to give it to my little Nephews. I want to add a scope and such. Anyone figure out what the air tank is made off LOL.


isn't the sprinkler valve a bit big for a pellet gun, i would use a qev and blowgun trigger, this would also give the gun better lines.
If I knew what a Qev was and how to build one I wouldn't use a sprinkler valve. I had nothing but trouble with them.They want seal and they let air out the barrel.


a qev is like a diaphragm or piston/diaphragm valve the one i bought is the piston kind. qevs also increase the power.

and i don't know where you can buy them because i live in the uk but i think mcmasters.com or something has them.
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Unread postAuthor: Chuck » Sat Oct 13, 2007 1:14 pm

ALIHISGREAT wrote:
Chuck wrote:
ALIHISGREAT wrote:
Chuck wrote:Well here it is starting to look more and more like a gun now. I decided to make it a pistol. I want to give it to my little Nephews. I want to add a scope and such. Anyone figure out what the air tank is made off LOL.


isn't the sprinkler valve a bit big for a pellet gun, i would use a qev and blowgun trigger, this would also give the gun better lines.
If I knew what a Qev was and how to build one I wouldn't use a sprinkler valve. I had nothing but trouble with them.They want seal and they let air out the barrel.


a qev is like a diaphragm or piston/diaphragm valve the one i bought is the piston kind. qevs also increase the power. Are they better than a sprinkler valve. and do they cost moer please let me know something .Chuck

and i don't know where you can buy them because i live in the uk but i think mcmasters.com or something has them.
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Unread postAuthor: ALIHISGREAT » Sat Oct 13, 2007 1:41 pm

Chuck wrote:
ALIHISGREAT wrote:
Chuck wrote:
ALIHISGREAT wrote:
Chuck wrote:Well here it is starting to look more and more like a gun now. I decided to make it a pistol. I want to give it to my little Nephews. I want to add a scope and such. Anyone figure out what the air tank is made off LOL.


isn't the sprinkler valve a bit big for a pellet gun, i would use a qev and blowgun trigger, this would also give the gun better lines.
If I knew what a Qev was and how to build one I wouldn't use a sprinkler valve. I had nothing but trouble with them.They want seal and they let air out the barrel.


a qev is like a diaphragm or piston/diaphragm valve the one i bought is the piston kind. qevs also increase the power. Are they better than a sprinkler valve. and do they cost moer please let me know something .Chuck

and i don't know where you can buy them because i live in the uk but i think mcmasters.com or something has them.


wt? you just quoted me and didn't add anything??
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Unread postAuthor: Chuck » Sat Oct 13, 2007 9:47 pm

I'm sorry I wondered how someone did that. I didn't even know I did. I said I looked on the Fastinall site and didn't see any Qev's are they called something else.
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Unread postAuthor: thespeedycicada » Sat Oct 13, 2007 10:25 pm

well they are also called quick exaust valves you will know one when you see one.Usually looks like a beefed up sprinkler valve/gas regulator thing.With three ports on it.
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current projects: co-axial piston valve.Status DONE!
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Unread postAuthor: ALIHISGREAT » Sun Oct 14, 2007 2:59 am

Chuck wrote:I'm sorry I wondered how someone did that. I didn't even know I did. I said I looked on the Fastinall site and didn't see any Qev's are they called something else.


http://www.fastenal.com/web/products/detail.ex?sku=0443030

this is the same kind as my quick exhaust valve, the pilot goes on the p-side (the right in the pic) the chamber goes on the bittom in the pic and the barrel goes on the left.

to pilot one you need these things (in order from the valve most should be brass) 1/2 to 1/4 reducer, 1/4 equal tee, a non-return or check valve, and a threaded shrader with the correct reducer, then the pilot is a blowgun which goes on the base of the tee.



valve-reducer-tee-nonreturn-reducer-schrader
l
blowgun
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Unread postAuthor: ALIHISGREAT » Sun Oct 14, 2007 3:01 am

Chuck wrote:I'm sorry I wondered how someone did that. I didn't even know I did. I said I looked on the Fastinall site and didn't see any Qev's are they called something else.


http://www.fastenal.com/web/products/detail.ex?sku=0443030

this is the same kind as my quick exhaust valve, the pilot goes on the p-side (the right in the pic) the chamber goes on the bittom in the pic and the barrel goes on the left.

to pilot one you need these things (in order from the valve most should be brass) 1/2 to 1/4 reducer, 1/4 equal tee, a non-return or check valve, and a threaded shrader with the correct reducer, then the pilot is a blowgun which goes on the base of the tee.



valve-reducer-tee-nonreturn-reducer-schrader
.......................l
................... blowgun

(the dots are just to make it line up)
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Unread postAuthor: Chuck » Mon Oct 15, 2007 5:44 am

Could someone draw a diagram how the Qev is set inline to the discharge barrel. What goes first then next and so forth until the exit.Thanks Chuck
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Unread postAuthor: jackssmirkingrevenge » Mon Oct 15, 2007 6:04 am

Here's a typical QEV over-under setup, courtesy of iPainball:

Image

(details here)

There are other configurations depending on what QEV you have, like this and this.
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Unread postAuthor: ALIHISGREAT » Mon Oct 15, 2007 11:06 am

you could also have the chamber facing backwards to act a a stock.

also i am inthe middle of planning my entry but i am wondering if a blow gun has a good enough flow to act as the main valve on a bb gun?
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Unread postAuthor: jackssmirkingrevenge » Mon Oct 15, 2007 3:03 pm

Enough to penetrate a soup tin with a 0.22 pellet at 100 psi and 1 metre long barrel.
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Unread postAuthor: ALIHISGREAT » Mon Oct 15, 2007 3:16 pm

jackssmirkingrevenge wrote:Enough to penetrate a soup tin with a 0.22 pellet at 100 psi and 1 metre long barrel.


hmm sounds good but i wonder what the difference would be if i used a qev probably 1/2"?
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Unread postAuthor: jackssmirkingrevenge » Mon Oct 15, 2007 3:31 pm

in a word, considerable.
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