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Gas Valve
The red gas valve. Man working in oil or gas refinery, turning the pipeline valve on and off to close or open the pipeline
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. Valves are technically valves fittings, but are usually discussed as a separate category. 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
Valve. (2015, January 7). In Wikipedia, The Free Encyclopedia. Retrieved 05:04, March 30, 2015, from http://en.wikipedia.org/w/index.php?title=Valve&oldid=641383183