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A valve is a device that regulates the flow of a fluid like for instance slurries, fluidized gases or regular gases, liquids, by opening, closing or partially obstructing particular passageways. Valves are usually pipe fittings but are typically discussed as a separate category. In situations where an open valve is concerned, fluid flows in a direction from higher to lower pressure.
Numerous applications such as commercial, military, industrial, residential and transport businesses make use of valves. Some of the main trades that rely on valves comprise the power generation, water reticulation, sewerage, oil and gas sector, mining and chemical manufacturing.
Most valves being used in everyday activities are plumbing valves, which are utilized in taps for tap water. Several common valves consist of kinds 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 control the blood circulation. Heart valves likewise regulate the circulation of blood in the chambers of the heart and maintain the proper pumping action.
Valves can be operated in a variety of ways. Like for example, they could be operated either by a handle, a pedal or a lever. Valves could be driven by changes in flow, temperature or pressure or they can be automatic. These changes may act upon a piston or a diaphragm which in turn activates the valve. Various popular examples of this particular kind of valve are seen on boilers or safety valves fitted to hot water systems.
Valves are utilized in numerous complex control systems that can require an automatic control that is based on external input. Regulating the flow through the pipe to a changing set point is an example. These situations usually require an actuator. An actuator will stroke the valve depending on its input and set-up, which enables the valve to be positioned accurately while allowing control over a variety of requirements.