"Valves" can refer to several different concepts depending on the context, so I'll cover a few of them: 1. **Mechanical Valves**: In engineering and plumbing, a valve is a device that regulates, directs, or controls the flow of fluids (liquids or gases) by opening, closing, or partially obstructing pathways. Common types of mechanical valves include gate valves, ball valves, check valves, and pressure relief valves.
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