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A valve is a device that regulates the flow of a fluid such as fluidized gases or regular gases, liquids, slurries, by partially obstructing, opening or closing particular passageways. Valves are normally pipe fittings but are typically 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 used in many applications like transport, commercial, military, industrial and residential businesses. A few of the major trades that rely on valves include the oil and gas sector, mining, chemical manufacturing, power generation, water reticulation and sewerage.
In every day activities, the most popular valves are plumbing valves as seen as it taps for tap water. Other common examples include small valves fitted to washing machines and dishwashers, gas control valves on cookers, valves inside 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 correct pumping action.
Valves can be worked in various ways. Like for example, they could be worked either by a lever, a handle or a pedal. Valves can be driven by changes in temperature, pressure or flow or they can be automatic. These changes may act upon a diaphragm or a piston which in turn activates the valve. Several popular examples of this type of valve are seen on safety valves or boilers fitted to hot water systems.
There are more complicated control systems using valves that need automatic control which is based on external input. Like for example, controlling flow through a pipe to a changing set point. These situations usually need an actuator. An actuator will stroke the valve depending on its set-up and input, allowing the valve to be positioned precisely while enabling control over a variety of requirements.