A valve is a mechanical device used to control, regulate, or direct the flow of fluids (liquids, gases, or slurries) within a system. Valves work by opening, closing, or partially obstructing passageways in pipelines. They come in various types—including ball valves, gate valves, globe valves, butterfly valves, and check valves—each suited for specific applications depending on flow requirements, pressure levels, and operating conditions. Valves are essential components in industries such as water supply, oil and gas, chemical processing, HVAC, and manufacturing. They can be operated manually, electrically, pneumatically, or hydraulically.