SpudFiles

Hi! i Want to make airgun i have qev valve and some pipes and air chamber , can someone instruct me how to make airgun with this items>

Spudfiles is a very large data base of spud canon information. There is web page after web page here about this very type of cannon configuration. Do some research on this, it's fun...

Welcome to Spudfiles!

Welcome to spudfiles!

Here's the basics, however as jrrdw pointed out there is plenty of information already out there for you to seek out.

Or something like this What is the barrel and air source

i will try that

Hi , I made that , like he , but i dont add spring to QEV , and i dont know but its not working , i open ball valve and the air go from the valve where i pumps air , I need to add spring or what ? Plase help

If you want to fill from the chamber side, then you have to modify the piston/diaphragm. An easy way to do this is to heat up a pin and poke a hole in the outer edge.

Did you try filling it up from the nipple on the ball valve?

Another good explanation

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I fill air to that

looks right to me. Is the valve stuck perhaps? With no air pressure, can you push the piston back towards the pilot?

I cant, rubber thing is stuck, i cant pull it out and i hear the air escape

Air leak not good, try some thread sealer like Pro dope

I think i resolve that problem. What is better for qev , Ball valve or air compressor gun? Which allows me to have more power?

Air gun will give you a ready made trigger

Regardless of the pilot valve you chose, the best way to increase performance is to remove the dead space between the pilot valve and the QEV: