What is a valve that can be opened and closed quickly and easily?
I want to make my own water gun (a la supersoaker), the only pitfall I have is I can't find an appropriate valve. A sprinkler valve requires electricity, a modded one will only close when all pressure is released, a ball valve would move to slowly, or be to stiff for a simple trigger mechanism... and I did have another example, but can't remember it.
Essentially I want a valve with a semi-automatic action that can release large volumes of propellant.
Thanks in advance.