No, they are ussually rated for 160psi or so, but I could use the program however I am having trouble opening the executable file. So I'm still working on that.

You can get higher rated ball valves, but I really like the use of a blogun as a relief trigger mechanism.

Sorry for the illinformed question guys. I had very little sleep yesterday and wasn't even sure on some of my measurements.

Aside from the sizes I already gave. The rocket weighs approx 2.6 oz and has a diameter of 2.16 inches. I want to be able to fire the rocket at 240fps at 150-200 psi using ...

What size supply chamber do I need???

I want to fire a Nerf Vortex from a 2" Barrel, 18" long. Sprinkler valve system and I need my supply chamber to be only 1' long or less and on a 60degree down slope to hide in a stock.

Also I plan on using a smaller diameter steel tubing for the supply ...