Hi guys! I'm making a cannon that has an electrically activated sprinkler gun that has a ball valve in the back. The problem is, whenever I open the ball valve to fill the intermediate chamber, air bursts out of the sprinkler valve! I'm only pressurizing it up to ~30psi, and the air is still coming ...

Awesome guys, thanks for the suggestions! This seems like an awesome community. I'll try these out and post my results.

Hi there, I'm new at this whole pneumatic cannon thing, so I've got a quick question. I made a cannon with a simple ball valve, and it works great. Now I'm trying to move up in the world. I'm trying to make a semiautomatic gun that you load from the barrel. My current plan is to have the chamber hol...