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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 partially obstructing, opening or closing certain passageways. Valves are generally pipe fittings but are usually 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 various applications like commercial, military, industrial, residential and transport industries. A few of the major trades which rely on valves consist of the mining, chemical manufacturing, power generation, water reticulation, sewerage and oil and gas sector.
Most valves being used in day to day activities are plumbing valves, which are used in taps for tap water. Other common valves consist of those 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 even control the circulation of blood in the chambers of the heart and maintain the proper pumping action.
Valves can be operated in several ways. For example, they could be worked either by a pedal, a lever or a handle. Valves can be driven by changes in flow, temperature or pressure or they can be automatic. These changes could act upon a piston or a diaphragm which in turn activates the valve. Several common examples of this particular type of valve are seen on boilers or safety valves fitted to hot water systems.
There are more complex control systems making use of valves that require automatic control which 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, that enables the valve to be situated precisely while enabling control over different needs.
