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QEV Compatibility Question

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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QEV Compatibility Question

Unread postAuthor: ammosmoke » Fri Sep 24, 2010 4:52 pm

Hey all, so I'm considering making a mini to shoot 6mm ball bearings. I have an ASCO 1/8" 3 way QEV valve like this one.

http://www.indautomation.com/pdf/asco/qexhausts.pdf


I had a design all planned out, but then I realized that it may not seal if I fill it from the chamber side like I want to. Do you guys think it would work?

Thanks,

Ammo
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Unread postAuthor: Gun Freak » Fri Sep 24, 2010 4:54 pm

If there is not a spring in the back, add one, then poke a hole in the diaphragm. If there is already a spring then all you need to do is poke the hole and it should be good. Use a needle to poke a very small hole.
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Unread postAuthor: ammosmoke » Fri Sep 24, 2010 5:37 pm

Where exactly would I be poking this hole? The diaphragm has a large gap around it. Here is a couple pics. (Crappy cell pics, but it was in my pocket.)

Image

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Unread postAuthor: Technician1002 » Fri Sep 24, 2010 5:54 pm

The very small hole would go from the pilot area to the chamber area so the pressure can balance between them as the chamber is filled. Do not put a hole out to the barrel from the pilot. That would be bad.
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Unread postAuthor: ammosmoke » Fri Sep 24, 2010 7:24 pm

Oh, so shouldn't be good then? There is about a 1/16th gap all the way around the diaphragm as it is.

EDIT: NVM, I see what you are saying. I just looked at the other side... Duh..
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