Expansion Tank

Cannons powered by pneumatic pressure (compressed gas) using a valve or other release.
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miskaman
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I've heard you need an expansion chamber if you want to safely use Co2 in a cannon. Is that true? Because I've seen guns with and without such chambers running on regulated Co2.
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Gippeto
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No, you do not need an expansion chamber, IF you use a regulator to reduce the pressure, OR your canon was built to handle the unregulated pressure safely.

An expansion chamber would allow a given volume of co2 (say a 12g cartridge) to expand to a lower pressure for direct use in your cannon.
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