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Adding a popoff valve to a quick exhaust valve

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Adding a popoff valve to a quick exhaust valve

Unread postAuthor: lklaussen » Sat Jan 07, 2012 9:10 pm

I made my semi auto airsoft/paintball gun, had fun with it, but am seeking some full auto. I have a home made poppoff valve currently popping around 60-70 psi, and need to hook that up to the qev. How is that done?

here is a pic of the gun currently. its a qev with a slide valve, and about 8 inches of 1/2 inch pipe as a chamber.

Image
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Unread postAuthor: ramses » Sat Jan 07, 2012 9:39 pm

The popoff valve needs to be attached to the same port as the air inlet.

You may need to restrict flow from your air source to get it to actually cycle.
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Unread postAuthor: jackssmirkingrevenge » Sun Jan 08, 2012 1:39 am

[youtube]http://www.youtube.com/watch?v=nkibwn6wEns[/youtube]

This should be pretty clear.
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Unread postAuthor: lklaussen » Sun Jan 08, 2012 9:29 am

So if the air in is just on the "small chamber side", how does the diaphragm reset to let it fire again?
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Unread postAuthor: POLAND_SPUD » Sun Jan 08, 2012 10:07 am

thx to a spring you can see in his video
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Unread postAuthor: ramses » Sun Jan 08, 2012 11:26 am

Oh, I guess you could do that too...
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Unread postAuthor: lklaussen » Sun Jan 08, 2012 12:47 pm

How does that reset it though? Wouldn't that just open it when the popoff pressure is reached and just dump the whole pressure tank?
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Unread postAuthor: ramses » Sun Jan 08, 2012 1:03 pm

You must use a secondary air chamber that is refilled by a much larger chamber.

You fill the secondary chamber through a relatively small (~.2 or smaller) opening. This then leaks into the pilot area around the piston. When the pilot area exceeds a certain pressure, the pop-off quickly reduces the pressure, causing the valve to open. This dumps the secondary chamber through a large (.5" or bigger) opening very quickly. The valve then re-seats and the process repeats.
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Unread postAuthor: lklaussen » Sun Jan 08, 2012 1:20 pm

Ahh that would make a little more sense! :D
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Unread postAuthor: jackssmirkingrevenge » Sun Jan 08, 2012 1:37 pm

ramses wrote:You must use a secondary air chamber that is refilled by a much larger chamber.

You fill the secondary chamber through a relatively small (~.2 or smaller) opening.


Pretty much, but note that this point between the firing chamber and the main chamber is the firing valve ;)

Flow from the firing valve determines rate of fire. Fast flow -> Fast rate of fire and vice versa.
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Unread postAuthor: POLAND_SPUD » Sun Jan 08, 2012 2:21 pm

Flow from the firing valve determines rate of fire. Fast flow -> Fast rate of fire and vice versa.

which means you could use a flow control valve to adjust ROF on the spot


ohh and yes jsr that was pinky and the brain refference :wink:
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Unread postAuthor: ramses » Sun Jan 08, 2012 2:25 pm

Correct.

If you have too much flow, you may have created a fart machine.
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