A valve is a device that regulates, directs or controls the flow of a fluid (gases, liquids, fluidized solids, or slurries) by opening, closing, or partially obstructing various passageways. In an open valve, fluid flows in a direction from higher pressure to lower pressure. The word is derived from the Latin valva, the moving part of a door, in turn from volvere, to turn, roll. The different types of valves include foot valve, stop valve, no-return valve, butterfly valve, diaphragm valve, pinch valve, pressure relief valve and control valve. Browse through this category for various valves available in Zambian stores.