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Why does this guy's automatic air cannon have 2 valves?

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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Why does this guy's automatic air cannon have 2 valves?

Unread postAuthor: Chauvo » Mon Jul 31, 2017 11:37 pm

https://youtu.be/2bhg2izg0gA

From what I understand, the bb with a spring near the trigger is what makes it automatic... So what is the purpose of the sprinkler valve?
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Re: Why does this guy's automatic air cannon have 2 valves?

Unread postAuthor: jackssmirkingrevenge » Tue Aug 01, 2017 6:46 pm

The sprinkler valve is the main valve but it needs to be piloted to fire. By having a pop-off valve as the pilot, it will be piloted at certain intervals effectively giving full-auto fire.

I did this with a eBay Quick Exhaust Valve coupled with a pop-off safety valve:

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