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A valve is a device that controls the flow of a fluid like liquids, slurries, fluidized gases or regular gases, by partially obstructing, opening or closing particular passageways. Valves are normally pipe fittings but are commonly discussed as a separate category. In instances where an open valve is concerned, fluid flows in a direction from higher to lower pressure.
Many applications like commercial, military, industrial, residential and transport businesses use valves. Some of the main businesses which depend on valves include the power generation, water reticulation, sewerage, oil and gas sector, mining and chemical manufacturing.
Most valves being used in everyday activities are plumbing valves, which are utilized in taps for tap water. Various common valves consist of ones fitted to washing machines and dishwashers, 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 regulate the blood flow. Heart valves likewise control the circulation of blood in the chambers of the heart and maintain the proper pumping action.
Valves could be used and worked in numerous ways that they could be worked by a lever, a handle or a pedal. In addition, valves could be operated automatically or by changes in pressure, flow or temperature. These changes can 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.
There are more complicated control systems utilizing valves which require automatic control that is based on external input. For instance, controlling flow through a pipe to a changing set point. These circumstances generally need an actuator. An actuator would stroke the valve depending on its input and set-up, allowing the valve to be places precisely while enabling control over various needs.
