a valve is a device or natural object that regulates, directs, or controls the flow of fluids (gasses, liquids, fluidized solids, or slurries) in various pathways by opening, closing, or partially blocking them. a valve is a device or natural object that regulates, directs, or controls the flow of fluids (gasses, liquids, fluidized solids, or slurries) in various pathways by opening, closing, or partially blocking them.
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