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A valve is a device which controls the flow of a fluid like for example 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 situations where an open valve is concerned, fluid flows in a direction from higher to lower pressure.
Many applications like residential, transport, commercial, military and industrial businesses utilize valves. Some of the main industries that rely on valves include the sewerage, oil and gas sectors, mining, chemical manufacturing, power generation and water reticulation.
Most valves being used in everyday activities are plumbing valves, which are utilized in taps for tap water. Various common valves include those fitted to dishwashers and washing machines, gas control valves on cookers, valves in car engines and safety devices fitted to hot water systems. In nature, veins inside the human body act as valves and control the blood circulation. Heart valves likewise control the flow of blood in the chambers of the heart and maintain the proper pumping action.
Valves could be utilized and worked in many ways that they could be operated by a handle, a pedal or a lever. Also, valves could be worked automatically or by changes in temperature, pressure or flow. These changes may act upon a diaphragm or a piston which in turn activates the valve. Several popular examples of this kind of valve are seen on safety valves or boilers fitted to hot water systems.
There are more complicated control systems utilizing valves which need automatic control which is based on external input. For example, controlling flow through a pipe to a changing set point. These situations usually require an actuator. An actuator will stroke the valve depending on its set-up and input, allowing the valve to be positioned precisely while allowing control over a variety of needs.
