An aortic valve replacement is used to treat conditions affecting the aortic valve.
a valve is a mechanism that opens and closes to control the flow of fluids. In a scientific context, fluids include both liquids and gases any substance that can flow freely and valves may use either. Valves control fluid flow in motors, plumbing, irrigation, pneumatic and hydraulic systems.
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What is a Valve? (with pictures) wiseGEEK
a valve is a mechanical device that blocks a pipe either partially or completely to change the amount of fluid that passes through it. When you turn on a faucet (tap) to brush your teeth, youre opening a valve that allows pressurized water to escape from a pipe.
A valve is a device or natural object 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 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.