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A valve is a device used to control the fluid flow through a pipe. Shown below is a schematic of one
type of valve -- there are many more. Valves simply constrict the flow of a fluid through a pipe.
They may be completely opened to allow normal flow, completely closed to stop flow, or placed somewhere
in between to limit flow. They work on both liquid and gas streams, and are often found on the
exit stream of a tank.
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© 2007 Arizona Board of Regents for The University of Arizona |