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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 closing, partially obstructing or opening particular passageways. Valves are normally pipe fittings but are usually 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 such as industrial, residential, transport, commercial and military businesses make use of valves. Some of the major trades which rely on valves comprise the oil and gas sector, mining, chemical manufacturing, power generation, water reticulation and sewerage.
Most valves being used in everyday activities are plumbing valves, which are utilized in taps for tap water. Several popular valves include 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 control the blood flow. Heart valves even regulate the circulation of blood in the chambers of the heart and maintain the right pumping action.
Valves could be operated in a variety of ways. Like for example, they could be worked either by a lever, a handle or a pedal. 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. Some common examples of this kind of valve are found on boilers or safety valves fitted to hot water systems.
Valves are used in many complex control systems which can require an automatic control which is based on external input. Regulating the flow through the pipe to a changing set point is an example. These situations generally need an actuator. An actuator would stroke the valve depending on its set-up and input, that enables the valve to be places precisely while enabling control over several requirements.
