Coaxial Piston Valve Question(SOLVED)
Hi, I'm new to spudfiles and spud guns in general. After building a successful ball valve airgun I have decided to try to build a coaxial piston valve. I have seen valves with a spring behind the piston but I have also seen ones without a spring. Could somebody please explain the pros and cons of using a spring? In what situation would I use a spring?
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