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Where can i find a 15mm QEV?

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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Where can i find a 15mm QEV?

Unread postAuthor: Goats spudz » Tue Aug 02, 2011 12:41 pm

i need a 15mm QEV that can be filled via the tank?
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Re: Where can i find a 15mm QEV?

Unread postAuthor: jackssmirkingrevenge » Tue Aug 02, 2011 12:50 pm

Goats spudz wrote:i need a 15mm QEV...


Here.

...that can be filled via the tank?


You'll need to modify it with a spring behind the piston and a hole in the piston/diaphragm, assuming what you mean is "fill from the chamber side".
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Unread postAuthor: Goats spudz » Tue Aug 02, 2011 1:51 pm

Image
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Unread postAuthor: jackssmirkingrevenge » Tue Aug 02, 2011 2:10 pm

It will work but the QEV needs to be modded,Brian's repeater is a good example.
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Unread postAuthor: mattyzip77 » Tue Aug 02, 2011 2:35 pm

Why not put that T that the schrader is in pilot side, saving time and modding???
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Unread postAuthor: aEx155 » Wed Aug 03, 2011 1:27 am

mattyzip77 wrote:Why not put that T that the schrader is in pilot side, saving time and modding???


The only reason I can think of not to do this is because it would increase the pilot volume. (I don't know how good a reason that is though)
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Unread postAuthor: jackssmirkingrevenge » Wed Aug 03, 2011 1:45 am

aEx155 wrote:The only reason I can think of not to do this is because it would increase the pilot volume. (I don't know how good a reason that is though)


Here's a compromise solution, fit a schrader valve to the blowgun and remove the core. This way, you can fill through the pilot (provided the blowgun is held open) and when you pilot, the flow isn't really restricted. You can improve it further by drilling out the schrader to 4.5mm

Postal cat silencer optional :)
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Unread postAuthor: Goats spudz » Wed Aug 03, 2011 12:23 pm

jackssmirkingrevenge wrote:
aEx155 wrote:The only reason I can think of not to do this is because it would increase the pilot volume. (I don't know how good a reason that is though)


Here's a compromise solution, fit a schrader valve to the blowgun and remove the core. This way, you can fill through the pilot (provided the blowgun is held open) and when you pilot, the flow isn't really restricted. You can improve it further by drilling out the schrader to 4.5mm

Postal cat silencer optional :)
WoW! i didnt think of that thanks :D
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Unread postAuthor: mattyzip77 » Wed Aug 03, 2011 12:45 pm

@ jack, not what I was thinking exacly, but I like this idea better! When you get to the desired pressure you want, you would just let off of the blow gun trigger and this would close the schrader, correct??? Nice!!!! 8) I like the pussy cat silencer as well!!! :wink:
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Unread postAuthor: jackssmirkingrevenge » Wed Aug 03, 2011 12:49 pm

mattyzip77 wrote:you would just let off of the blow gun trigger and this would close the schrader, correct?


Not exactly, the schrader in this case is not acting as a valve because the core is removed, all it is doing is providing a connection point with your pump or compressor - but yes, hold the blowgun open until desired chamber pressure is reached, release blowgun, remove pressure source, ready to fire.
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Unread postAuthor: Pneumaticology » Wed Aug 03, 2011 5:16 pm

Could you avoid modding the valve by having a bleed valve between the HPA tank and a small chamber? The chamber would fill to the PSI of the tank then when fired would begin to slowly refill via the bleed valve. Because it would be at a low pressure for an amount of time would it be sufficient to let the QEV's piston return?
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Unread postAuthor: Gun Freak » Wed Aug 03, 2011 8:24 pm

No QEV pistons are check valved so even with a spring it wouldn't work.
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Unread postAuthor: jackssmirkingrevenge » Wed Aug 03, 2011 11:08 pm

Gun Freak wrote:No QEV pistons are check valved so even with a spring it wouldn't work.


Technically it would, it's a complicated equivalent on poking an equalisation hole in the QEV diaphragm.

Also, man who mix epoxy with hands gets stuck in ;)
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Unread postAuthor: Gun Freak » Wed Aug 03, 2011 11:11 pm

That's way overcomplicated :D
check sig :D
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Unread postAuthor: Mr.Tallahassee » Thu Aug 04, 2011 12:15 am

waitandbleed.jpg..... Do I see a BFMV fan? :D Very interesting idea though. It might be worth some experimenting. Hmm, money money money.
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