The qev is 19 mm in diameter:)

It's a one shot Gun, i want a simple blow gun, but in Sweden i can only find blow Guns that is pressure rated to 10 bar:/

Were can I find a small pilot valve that I can use to trigger my QEV.
I want it to be able to work at 300 psi (20bars) pressure.


The current valve I´m using is a simple ball valve, witch I think is to big and it doesnt feel as a trigger.

Impressive!

I would try to optimise the piston a little, maybe using synthetic spacers instead of metal to save weight, and grinding down the sealing face nut for better flow, but otherwise great job!

Also, you only need one small (1mm dia is enough) equalisation hole...

Thanks for the tips:) I ...

Here is my new gun
http://i1267.photobucket.com/albums/jj549/GustavssonB/2012-09-06172557.jpg


It´s a golfball shooting QEV gun that has been taken to 8 bar pressure.

- Chamber: The chamber is a 1,25 liters extinguisher that holds up to 30 bars pressure
- The valves: The primary valve is a ...

archie370 wrote:This is pretty cool what kind of welder did you use for the fire extinguisher ... ?

Thanks, i used i MiG welder for the extinguisher:)

Haha wtf, wasn't going to repost that... I tried to change the title, not sure on why that happned:/

I welded the extinguisher to make it a different thread sice. The air is pumped on the pilot side of the qev, were the quick connect is:)

BTW: with a well made hammervalve all your components should be able to handle 20 to 25 bar.

The gun has now been tested with 20 bars pressure:D and its still holding nicely:)

Looks very nice. Do you have any idea what velocities you are reaching? What is the barrel made from and what diameter did you go with inside the barrel?

Thanks:) I have no idea how strong the Gun is but it's Pretty powerfull:)
I'm using a copper pipe as barrel with 10mm in diameter inside, and ...

Dude, thanks for all the good tips!:D I'm going to experiment with the Gun, and see which way that makes me happy:)

I'm going to replace it with a slide valve:) to make it semi auto

Thanks for all the good tips Brian the brain , but I didn't really understand how to make the Gun semiauto by just modding the QEV, don't you need 2 air tanks for that?

BTW: with a well made hammervalve all your components should be able to handle 20 to 25 bar.

Are you sure about that man, on ...

I made a simple test today whith a blowgun as a pilot valve for the QEV, and the result was better accuracy but the gun lost the clean look:(



Does anyone know a simular valve but is more compact and has a cooler look?

Is there any way to calculate how small chamber I can use before I'm loosing power? I want the chamber to be as small as possible so that the extinguisher last for as mant shots as possible:)