Lockednloaded wrote:I didn't say anything about a QEV
Apologies, I thought this was for use in another project.
I suggest doing some tests with the CO2 first. The problem isn't the pressure... and if I'm patronizing here, please forgive me. The temperature issue with using a propellant gas like CO2 comes from the fact that it's at room temperature, and thus can cool valves, seals, and other connections. Using a gas compressed on-site and used soon after compressing doesn't have the same issues because the gas heats on compression, and is still pretty hot just before it's decompressed. The biggest worry I'd have is that I'd get a valve frozen open and the thrust produced tears the gun out of my hands, damaging said hands and various other objects. Even just doing some leak tests on my ball valves with some 1,000psi air, when I vent the compressed volume (keeping in mind that these are ball valves) by opening one of the valves partway, it kicks back so hard I've lost my grip on it before.
Some simple (and safe!) testing should resolve any concerns.