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

Cannons powered by pneumatic pressure (compressed gas) using a valve or other release.
Chauvo
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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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jackssmirkingrevenge
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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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hectmarr wrote:You have to make many weapons, because this field is long and short life
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