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A valve is a device which regulates the flow of a fluid such as fluidized gases or regular gases, liquids, slurries, by opening, closing or partially obstructing certain passageways. Valves are usually pipe fittings but are commonly 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 many applications such as industrial, residential, transport, commercial and military industries. A few of the major industries which rely on valves include the water reticulation, sewerage, oil and gas sector, mining, chemical manufacturing and power generation.
In daily activities, the most common valves are plumbing valves as seen for the reason that it taps for tap water. Several popular examples comprise small valves fitted to dishwashers and washing machines, gas control valves on cookers, valves within 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 also regulate the circulation of blood in the chambers of the heart and maintain the proper pumping action.
Valves could be utilized and operated in many ways that they could be worked by a pedal, a lever or a handle. In addition, valves can be driven automatically or by changes in pressure, flow or temperature. These changes may act upon a diaphragm or a piston which in turn activates the valve. Various popular examples of this kind of valve are found on boilers or safety valves fitted to hot water systems.
Valves are utilized in a lot of complex control systems that could need an automatic control that is based on external input. Controlling the flow through the pipe to a changing set point is one example. These situations usually require an actuator. An actuator would stroke the valve depending on its set-up and input, allowing the valve to be places accurately while enabling control over various requirements.
