What does valve mean is a noun that describes a device or anatomical structure that controls flow of liquid, gas, or blood by opening and closing, acting like a gate or door. In mechanical engineering, valve is device installed in pipe or system that regulates, directs, or stops flow of fluid, such as water valve, gas valve, or air valve, by moving a disc, ball, or flap to allow or block passage, examples include ball valve, gate valve, check valve that allows flow one way, and pressure relief valve that opens to prevent overpressure. In automotive engines, valves control intake of fuel and air and exhaust of gases. In human body, heart has four valves, mitral, aortic, tricuspid, and pulmonary, that ensure blood flows one direction, opening and closing with heartbeat, and veins have valves that prevent backflow. Word valve comes from Latin valva meaning leaf of a folding door, reflecting its function as door like structure. In electronics, vacuum tube is also called valve in British English. Figuratively, valve can mean outlet for releasing pressure or emotion, as in safety valve. In company name Valve Corporation, name evokes idea of controlling flow of entertainment. Overall, valve means controllable opening that regulates flow.
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