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A valve is a device which regulates the flow of a fluid like for instance slurries, fluidized gases or regular gases, liquids, by partially obstructing, opening or closing particular passageways. Valves are usually 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 for instance residential, transport, commercial, military and industrial businesses utilize valves. Some of the major industries which rely on valves include the water reticulation, sewerage, oil and gas sector, mining, chemical manufacturing and power generation.
Most valves being utilized in day to day activities are plumbing valves, which are utilized in taps for tap water. Various popular valves comprise ones 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 in the human body act as valves and regulate the blood circulation. Heart valves even control the flow of blood in the chambers of the heart and maintain the proper pumping action.
Valves could be used and operated in various ways that they could be worked by a pedal, a lever or a handle. Moreover, valves could be worked automatically or by changes in flow, temperature or pressure. These changes can act upon a piston or a diaphragm which in turn activates the valve. Several popular examples of this kind of valve are seen on boilers or safety valves fitted to hot water systems.
There are more complex control systems using valves that need automatic control that is based on external input. Like for instance, controlling flow through a pipe to a changing set point. These circumstances usually require an actuator. An actuator would stroke the valve depending on its input and set-up, allowing the valve to be situated precisely while allowing control over various needs.
