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A valve is a device that controls the flow of a fluid like for example slurries, fluidized gases or regular gases, liquids, by partially obstructing, opening or closing particular passageways. Valves are normally pipe fittings but are usually 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 many applications like for instance transport, commercial, military, industrial and residential industries. Some of the major trades 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 day to day activities are plumbing valves, that are used in taps for tap water. Several common valves comprise 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 inside the human body act as valves and control the blood circulation. Heart valves also regulate the circulation of blood in the chambers of the heart and maintain the correct pumping action.
Valves can be operated in several ways. For instance, they could be operated either by a handle, a pedal or a lever. Valves can be driven by changes in pressure, flow or temperature or they can be automatic. These changes could act upon a piston or a diaphragm which in turn activates the valve. Several popular examples of this kind of valve are found on boilers or safety valves fitted to hot water systems.
Valves are used in numerous complicated control systems which can require an automatic control that is based on external input. Controlling the flow through the pipe to a changing set point is an example. These circumstances usually need an actuator. An actuator will stroke the valve depending on its set-up and input, that allows the valve to be places precisely while allowing control over different needs.
