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Valves assist to regulate the flow of a fluids like for example slurries, fluidized gases or regular gases, liquids by partially obstructing, opening or even by closing certain passageways. Typical valves are pipe fittings but are discussed as a separate category. In cases where an open valve is concerned, fluid flows in a direction from higher to lower pressure.
Valves are used in various applications like transport, commercial, military, industrial and residential businesses. Some of the main industries which depend on valves comprise the power generation, water reticulation, sewerage, oil and gas sector, mining and chemical manufacturing.
In every day activities, the most popular valves are plumbing valves as seen as it taps for tap water. Various popular examples comprise small valves fitted to dishwashers and washing machines, 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 circulation. Heart valves likewise control the flow of blood in the chambers of the heart and maintain the right pumping action.
Valves can be utilized and worked in a lot of ways that they could be operated by a lever, a handle or a pedal. Moreover, valves could be driven automatically or by changes in pressure, flow or temperature. These changes could act upon a piston or a diaphragm which in turn activates the valve. Some common examples of this kind of valve are found on safety valves or boilers fitted to hot water systems.
There are more complex control systems making use of valves that need automatic control that is based on external input. For example, controlling flow through a pipe to a changing set point. These circumstances normally require an actuator. An actuator would stroke the valve depending on its input and set-up, allowing the valve to be positioned accurately while allowing control over different needs.
