Dual Action Pneumatic Air Cylinder

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Google is your friend, I'm not an expert, but have repaired simple 2 way foot valves used on my sand blast cabinet, as well the safety shut off valve on the same tool. They fail when a rubber O-ring slides past a drilled hole in the valve, which ends up tearing it. I have plastic parts fail, that I replaced with lathe machined aluminum.
Here is one link, that has more near the end.
https://www.thomasnet.com/articles/p...eumatic-valves
Just like you found a YouTube video, there are many more that are instructive in this subject.

Can you share what sort of mechanism your making? Many others on this forum have much experience and can suggest ideas that would take years to figure out. Including any pitfalls.