Like, they don’t have an opening right? How are they sealed?
EDIT: I should rephrase: there has to be some sort of machine that pressurizes, and, in the pressurized environment, seals the opening while not letting out air. How does that look like?
In: Engineering
[This page has a cutaway](https://officechairpicks.com/gas-cylinder/), as you can see the tube isn’t solid there are openings at the top and bottom. The bottom is filled with compressed air from that opening, then the opening is sealed.
The top opening is controlled by the height lever, that hissing sound is air going into/out of the top part which controls how far the compressed gas in the bottom part can push upwards.
They have an opening, it’s just one-time filled then pinched and welded shut.
Or the retainer ring can be opened, filled, then pinched and welded shut,
As others have said, they happen to have sealable openings or valves buuuut…
Lets say you needed a sealed vessel that has no openings after its manufacture. You would achieve this by constructing the cylinder/vessel in either a vacuum or compressed chamber.
So if you want a pressurized component you would construct your part under pressure so when you remove it, the space inside your now sealed part would contain the same pressure as the “room” it was built in.
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