Valve is a mechanical device that controls the flow of fluids (gases, liquids, fluidized solids) by opening, closing, or partially obstructing various passageways.
In anatomy, valve refers to a membranous fold in a hollow organ or tubular structure that prevents reflux of the fluid passing through it.
The term "Valve" also refers to:
1. Valve Corporation - an American video game developer and digital distribution company
2. Valve in electronics - a vacuum tube
3. Valve in music - a device on some brass instruments