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A valve is a device that regulates the flow of a fluid such as liquids, slurries, fluidized gases or regular gases, by opening, closing or partially obstructing particular passageways. Valves are usually 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 utilized in various applications like for instance industrial, residential, transport, commercial and military trades. Some of the main businesses that depend on valves comprise the mining, chemical manufacturing, power generation, water reticulation, sewerage and oil and gas sector.
Most valves being utilized in day to day activities are plumbing valves, that are utilized in taps for tap water. Various popular valves comprise 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 in the human body act as valves and regulate the blood flow. Heart valves also regulate the circulation of blood in the chambers of the heart and maintain the right pumping action.
Valves could be worked in a variety of ways. For instance, they can 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 diaphragm or a piston which in turn activates the valve. Some common examples of this particular type of valve are found on boilers or safety valves fitted to hot water systems.
There are more complex control systems utilizing valves which require automatic control that 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 would stroke the valve depending on its input and set-up, which allows the valve to be places accurately while allowing control over a variety of requirements.