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A valve is a device that controls the flow of a fluid like slurries, fluidized gases or regular gases, liquids, by closing, partially obstructing or opening particular 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.
Many applications like for instance commercial, military, industrial, residential and transport industries utilize valves. Some of the major trades that rely on valves consist of the sewerage, oil and gas sectors, mining, chemical manufacturing, power generation and water reticulation.
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 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 within the human body act as valves and control the blood flow. Heart valves also regulate the circulation of blood in the chambers of the heart and maintain the proper pumping action.
Valves can be worked in a variety of ways. Like for instance, they can be operated either by a lever, a handle or a pedal. Valves can be driven by changes in temperature, pressure or flow or they could be automatic. These changes can act upon a diaphragm or a piston which in turn activates the valve. Several popular examples of this kind of valve are found on safety valves or boilers fitted to hot water systems.
There are more complicated control systems utilizing valves that require automatic control which is based on external input. Like for instance, controlling flow through a pipe to a changing set point. These situations generally need an actuator. An actuator will stroke the valve depending on its input and set-up, allowing the valve to be places precisely while enabling control over different needs.
