How does a QEV work?
Posted: Sun May 06, 2012 5:28 am
So I have looked at this around here but I am still confused. How does it work?
Spud Wiki > Pneumatic launchers > Piston valves
Or
Pneumatic Cannon Discussion (where this topic is posted) > Sticky: Piston Valves Explained Visually
QEV (Quick Exhaust Valve) = Piston valve/Diaphragm valve
Usually, we use the term QEV to describe a European or American store-bought valve whereas the French (and people on YouTube) usually use the term to describe a small homemade piston valve like this. They all work the same as a 'typical' piston valve housed in PVC fittings.
Edit: The concept is the same as a sprinkler valve; they all work due to unbalanced forces. A sprinkler valve seals the chamber whereas a QEV will usually seal the barrel.
