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Valves help to control the flow of a fluids such as fluidized gases or regular gases, liquids, slurries by partially obstructing, opening or even by closing some passageways. Typical valves are pipe fittings but are 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 such as industrial, residential, transport, commercial and military trades utilize valves. A few of the main industries that depend on valves comprise the mining, chemical manufacturing, power generation, water reticulation, sewerage and oil and gas sector.
Most valves being utilized in daily activities are plumbing valves, which are utilized in taps for tap water. Various common valves include those fitted to washing machines and dishwashers, gas control valves on cookers, valves inside car engines and safety devices fitted to hot water systems. In nature, veins inside the human body act as valves and control the blood flow. Heart valves likewise regulate the circulation of blood in the chambers of the heart and maintain the proper pumping action.
Valves could be used and worked in lots of ways that they can be worked by a lever, a handle or a pedal. Also, valves could be driven automatically or by changes in pressure, flow or temperature. These changes could act upon a diaphragm or a piston which in turn activates the valve. Various popular examples of this kind of valve are found on safety valves or boilers fitted to hot water systems.
Valves are used in many complicated control systems which can require an automatic control which is based on external input. Regulating the flow through the pipe to a changing set point is one example. These situations usually need an actuator. An actuator would stroke the valve depending on its set-up and input, allowing the valve to be situated precisely while allowing control over a variety of needs.