+A **valve** is a device that regulates, directs, or controls the flow of a [fluid](/wiki/fluid) by opening, closing, or partially obstructing passageways. They are essential components in many systems, managing [pressure](/wiki/pressure) and direction, from plumbing to industrial processes.
+## See also
+- [Pump](/wiki/pump)
+- [Engine](/wiki/engine)
+- [Flow](/wiki/flow)