check valve

Cannons powered by pneumatic pressure (compressed gas) using a valve or other release.
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Fnord
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I would use one of JSR's ideas in this case. Remove the spring from a schrader valve, then solder it into a 3/4 pipe nipple or something. (hint: don't heat it up and solder when the valve part is in it. Screw it in afterward)
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keep_it_real
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Or just use a presta valve and you don't even have to take the spring out. I think it might even have higher flow then a schrader valve.
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