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Valves assist to regulate the flow of a fluids such as slurries, fluidized gases or regular gases, liquids by closing, partially obstructing or even by opening some passageways. Regular valves are pipe fittings but are 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 like for instance military, industrial, residential, transport and commercial businesses make use of valves. A few of the main industries which rely on valves consist of the water reticulation, sewerage, oil and gas sector, mining, chemical manufacturing and power generation.
Most valves being utilized in everyday activities are plumbing valves, which are used in taps for tap water. Other popular valves consist of types 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 also regulate the circulation of blood in the chambers of the heart and maintain the right pumping action.
Valves can be operated in a variety of ways. Like for instance, they could be worked either by a pedal, a lever or a handle. Valves can be driven by changes in pressure, flow or temperature or they could be automatic. These changes may act upon a diaphragm or a piston which in turn activates the valve. Several common examples of this particular type of valve are seen on safety valves or boilers fitted to hot water systems.
There are more complicated control systems making use of valves which require automatic control that is based on external input. For example, regulating flow through a pipe to a changing set point. These circumstances usually need 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.
