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A valve is a device that controls the flow of a fluid like fluidized gases or regular gases, liquids, slurries, by partially obstructing, opening or closing certain passageways. Valves are generally pipe fittings but are commonly discussed as a separate category. In situations where an open valve is concerned, fluid flows in a direction from higher to lower pressure.
Various applications such as military, industrial, residential, transport and commercial businesses use valves. A few of the major trades which rely on valves include the mining, chemical manufacturing, power generation, water reticulation, sewerage and oil and gas sector.
Most valves being used in day to day activities are plumbing valves, that are used in taps for tap water. Various popular valves consist of 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 within the human body act as valves and control the blood circulation. Heart valves likewise regulate the flow of blood in the chambers of the heart and maintain the correct pumping action.
Valves could be used and operated in various ways that they can be worked by a lever, a handle or a pedal. Additionally, valves can be worked automatically or by changes in pressure, flow or temperature. These changes could act upon a piston or a diaphragm which in turn activates the valve. Various common examples of this particular type of valve are seen on boilers or safety valves fitted to hot water systems.
Valves are used in several complicated control systems that could need an automatic control which is based on external input. Regulating the flow through the pipe to a changing set point is one example. These circumstances generally need an actuator. An actuator would stroke the valve depending on its input and set-up, allowing the valve to be situated accurately while enabling control over different needs.
