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A valve is a device that regulates the flow of a fluid like for example liquids, slurries, fluidized gases or regular gases, by partially obstructing, opening or closing some passageways. Valves are usually 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 utilized in numerous applications like for example commercial, military, industrial, residential and transport industries. Some of the major trades which depend 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. Other common valves comprise types 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 in the human body act as valves and control the blood circulation. Heart valves likewise control the circulation of blood in the chambers of the heart and maintain the right pumping action.
Valves can be operated in various ways. Like for instance, they could be operated either by a pedal, a lever or a handle. Valves could be driven by changes in flow, temperature or pressure or they can be automatic. These changes may act upon a diaphragm or a piston which in turn activates the valve. Various common examples of this kind of valve are seen on safety valves or boilers fitted to hot water systems.
There are more complex control systems utilizing valves that need automatic control which is based on external input. For example, regulating flow through a pipe to a changing set point. These situations usually need an actuator. An actuator will stroke the valve depending on its input and set-up, allowing the valve to be positioned accurately while enabling control over a variety of requirements.
