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A dome valve might be described this way. Take a solid ring to use as a seat. Now cover the ring with a disk shaped like a contact lens or like a snow saucer. That curved surface will sit inside the ring to seal the valve, and to open it, a lever rotates the disk out of the way of the opening. Use the link to a picture of one. Clyde (in the UK) makes them, as do others, but this picture is animated! You'll get to see the dome valve in action, and that will probably make any further explanation unnecessary.

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17y ago

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