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full auto help

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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full auto help

Unread postAuthor: tjrobison11 » Tue Jul 31, 2012 3:15 pm

i am trying to use a safety valve with a qev to achieve full auto but when the pressure reaches the point to make the safety valve piolet it just leaks and dosent "pop-off". i you need pictures i can put them up, thank you for your help.
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Unread postAuthor: dewey-1 » Tue Jul 31, 2012 4:48 pm

Are you sure it is "pop off valve" rather than a "relief valve"?
Read here; Look at relief valves and safety valves.

Relief valve;
http://www.cdivalve.com/products/relief/relief.htm

Safety valve (pop off);
http://www.cdivalve.com/products/noncode/noncode.htm

They may even look the same.

Compare the NC to the PR models.
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Unread postAuthor: tjrobison11 » Tue Jul 31, 2012 5:06 pm

thanks , i figured it out, im just gonna make a snapvalve like btb's
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Unread postAuthor: jackssmirkingrevenge » Tue Jul 31, 2012 9:25 pm

Have you modified the piston or are you just using a standard one? some pictures would definitely help.

Pop-off piloted valves are extremely sensitive to pop-off pressure and flow from your trigger valve.

An adjustable pop-off is recommended, have you tried lowering the pop-off pressure?
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Unread postAuthor: Crna Legija » Wed Aug 01, 2012 3:46 am

[quote="jackssmirkingrevenge"]
An adjustable pop-off is recommended, have you tried lowering the pop-off pressure?[/quote

I wouldn't recommend them iv tried a few different types and they don't pop off more of a hiss still works but under powers the QEV, iv also seen others that say the same about them.
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Unread postAuthor: jackssmirkingrevenge » Wed Aug 01, 2012 3:55 am

The best route is to use the pop-off as a valve directly, as I had done with my various prototypes:

Modified pop-off valve

custom pop-off v1.0

custom pop-off v2.0

custom pop-off v3.0


Brian's snap valve is essentially the same thing.
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