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A valve is a device which controls the flow of a fluid like fluidized gases or regular gases, liquids, slurries, by partially obstructing, opening or closing some passageways. Valves are normally pipe fittings but are typically discussed as a separate category. In cases where an open valve is concerned, fluid flows in a direction from higher to lower pressure.
Valves are utilized in various applications like for instance residential, transport, commercial, military and industrial businesses. A few of the major trades which depend on valves comprise the power generation, water reticulation, sewerage, oil and gas sector, mining and chemical manufacturing.
Most valves being utilized in day to day activities are plumbing valves, which are utilized in taps for tap water. Other popular valves comprise types fitted to washing machines and dishwashers, gas control valves on cookers, valves within car engines and safety devices fitted to hot water systems. In nature, veins inside the human body act as valves and regulate the blood flow. Heart valves even regulate the circulation of blood in the chambers of the heart and maintain the correct pumping action.
Valves could be operated in various ways. Like for instance, they could be operated either by a handle, a pedal or a lever. Valves can be driven by changes in flow, temperature or pressure or they can be automatic. These changes may act upon a piston or a diaphragm which in turn activates the valve. Several common examples of this particular kind of valve are found on boilers or safety valves fitted to hot water systems.
Valves are used in a lot of complex control systems that could require an automatic control which is based on external input. Regulating the flow through the pipe to a changing set point is an example. These circumstances normally require an actuator. An actuator would stroke the valve depending on its input and set-up, that allows the valve to be situated precisely while allowing control over different needs.
