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A valve is a device which regulates the flow of a fluid like for instance liquids, slurries, fluidized gases or regular gases, by closing, partially obstructing or opening certain passageways. Valves are usually 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.
Valves are utilized in numerous applications like residential, transport, commercial, military and industrial trades. A few of the major industries that rely on valves consist of the chemical manufacturing, power generation, water reticulation, sewerage, oil and gas sector and mining.
Most valves being used in everyday activities are plumbing valves, which are utilized in taps for tap water. Several common valves comprise ones fitted to dishwashers and washing machines, gas control valves on cookers, valves within car engines and safety devices fitted to hot water systems. In nature, veins in 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 right pumping action.
Valves can be utilized and operated in several ways that they could be operated by a pedal, a lever or a handle. Furthermore, valves could be worked automatically or by changes in pressure, flow or temperature. These changes could act upon a diaphragm or a piston which in turn activates the valve. Some common examples of this particular kind of valve are seen on safety valves or boilers fitted to hot water systems.
Valves are utilized in numerous complicated control systems which may need an automatic control that is based on external input. Controlling the flow through the pipe to a changing set point is an example. These situations normally require an actuator. An actuator will stroke the valve depending on its set-up and input, allowing the valve to be places precisely while enabling control over a variety of needs.
