Someone help, I have Valve problems!?

Question

Ok , I am looking for a valve of some sort that is small (1/4 inch), that has high flow preferably lets all the air out at once.

This is for a air cannon type thing. lol

Answer 1

It is not the type of valve that is your problem unless you are making a very small one to shoot frozen blueberries  it is the small size of the 1/4" valve and its piping. Various "Spud Gun" plans show 3/4"-1 1/2" piping with ball valves as well as with RainBird Solenoid (quick-opening globe ?) valves. These typically have 1 1/2 -2 " barrels.

Answer 2

The valve with the biggest opening wins.  The type valve with the biggest opening is called a ball valve.  It is also the quickest one to open because you only have to turn the valve 90 degrees.

Th answer to you problem is, get a BIGGER VALVE and bigger lines.  Thmyth bustersrs use 6" valve which are 500 times bigger than 1/4 inch so they are 100 times more powerfull.