SpudFiles

Looks like it

damn... didn't think he would put that kind of info

anyway... that seems interesting... last time there was a QEV there (or maybe it was a different version of this?)
If you think of it, that seems a bit overcomplicated (he has a solenoid valve that sends air to the air cylinder that opens the valve)
Why did you choose this route ? becasue it's difficult to find stuff with high flow and rated high enough ?

If you think of it, that seems a bit overcomplicated (he has a solenoid valve that sends air to the air cylinder that opens the valve)

Well....Isn't that exactly the kind of thing solenoid valves and air cylinders are supposed to do?

yeah but it is a bit more complicated than 'a solenoid valve vents pilot volume'

anyway is it the same gun as the one that had a QEV there ? and if you replaced it, why did you do it?

lol it would be easier if you posted a schematic or something

POLAND_SPUD wrote:yeah but it is a bit more complicated than 'a solenoid valve vents pilot volume

The gun has 6.0 in^3 of pilot volume carrying 1000psi. Containing that much pressure and volume yet, being able to completely vent it in a couple of milliseconds is not an easy job. I know of no solenoid capable of the task.

is it the same gun as the one that had a QEV there ? and if you replaced it, why did you do it?

Look at my older posts. You'll find a video I posted showing low pressure semi-auto firing. Notice in the video the long "hiss' as the QEV vents the pilot gas. It caused a delay the main valve.

I made 4 different style pilot valves...all completely different. I knew before I made them that a ball valve is the very best but, I had to try it. The QEV you refer to was my first design. It worked but, it had a long vent time and as a result, the main valve lost some of it's power. After trying all possibilities, I decided to make my own ball valve. I know that QEV's are the valve of choice here on the SF but, I wouldn't have gone to the trouble of making a ball valve if it wasn't the best for the task at hand. It's fos is 3000+ psi and goes to full open in just a few milliseconds. At 1000psi it requires a very small amount of torque (shaft fully supported on bearings) to open. As a result, the main valve produces tremendous power and has no delay. The pilot vent gas is fast enough, it could easily fire a .500 projectile through a separate barrel. Ha

IMO...NOTHING works as well as a powered ball valve in high pressure/volume applications.

yeah thx that's more less the answer I wanted to get

The gun has 6.0 in^3 of pilot volume

lol that's more than chamber volume of quite a lot of high pressure guns posted here... how large was the QEV? 1/4"?

anyway it wouldn't hurt if you posted some schematics together with some damage vids soon

THAT IS INSANE!!! what are you going to shoot out of it.

urgle the danish cow wrote:THAT IS INSANE!!! what are you going to shoot out of it.

first post

Ammunition = 1.250 Ball Bearing

A few more details/schematics would be great here..internals..aluminum block bore-outs, sealing methods...etc.

Super effort on the cannon as a whole. 1 1/4" ball bearing ammo is going to be a nasty mother with 1000 psi behind it....

Awsome!

JHogg

That is an amazing gun with even better craftsmanship. Good job. Do you have more pictures of how the gun works? I like the PC fan cover sight.

Test Shots:
100 ft @1000psi nitrogen

3 round group

HOT DAMN! That was a 3 round group at 33 yards? Thats quite accurate, and my god, quite a bit powerful too. Looks like its time to invest in some really serious sand bags.

Just realised I happen to have a ball bearing of the same size you are shooting, these things are heavy! I was planning on shooting one from my hybrid but haven't got around to finding a barrel yet. The damage doesn't surprise me at all!

MrCrowley
I assure you....it won't even slow down for a fridge!

ya you could use a tank as a backstop but that might not do it