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How does a QEV work?

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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How does a QEV work?

Unread postAuthor: Theegle » Sun May 06, 2012 5:28 am

So I have looked at this around here but I am still confused. How does it work?
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Please correct me on grammar mistakes.
Also I'm new here so go easy on me.

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Unread postAuthor: MrCrowley » Sun May 06, 2012 5:38 am

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.
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