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A valve is a device which regulates the flow of a fluid like for example fluidized gases or regular gases, liquids, slurries, by opening, closing or partially obstructing certain passageways. Valves are generally pipe fittings but are commonly 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 such as transport, commercial, military, industrial and residential trades use valves. A few of the major businesses which rely on valves comprise the power generation, water reticulation, sewerage, oil and gas sector, mining and chemical manufacturing.
Most valves being used in everyday activities are plumbing valves, that are utilized in taps for tap water. Other popular valves include kinds 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 within the human body act as valves and regulate the blood circulation. Heart valves likewise control the circulation of blood in the chambers of the heart and maintain the proper pumping action.
Valves could be utilized and worked in lots of ways that they can be worked by a pedal, a lever or a handle. In addition, valves can be driven automatically or by changes in temperature, pressure or flow. These changes can act upon a piston or a diaphragm which in turn activates the valve. Various common examples of this kind of valve are found on safety valves or boilers fitted to hot water systems.
Valves are used in a lot of complex control systems which can need an automatic control that is based on external input. Controlling the flow through the pipe to a changing set point is one example. These circumstances normally require an actuator. An actuator would stroke the valve depending on its input and set-up, allowing the valve to be places precisely while allowing control over various needs.
