I made a piston valve design. It's a barrel sealing type, with the air tank under the barrel. The air tank is a 4 1/2' long 3" pvc, and the barrel is 2 1/2" pvc. I used a 2" Tee for the piston housing, with the air tank coming from the bottom. The piston is made up from a 1 1/2" plastic coupling, an...

How would I modify a sprinkler valve? I've google'd it, and still don't really understand. And since I'm using a 3 inch tank, and a 2 1/2 inch barrel, and the sprinkler valve is 1 inch, would I just reduce it, put the valve in, and up it to 2 1/2 again?

I'm doing a science project for school using a pneumatic launcher. I will be using different length barrels to see what length effectively launches a tennis ball farther. My idea is to use 4' long 3" sch40 pvc for the air chamber, and reduce that to 2 1/2" and attach a ball valve on to that. To the ...