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A valve is a device which controls the flow of a fluid like for instance slurries, fluidized gases or regular gases, liquids, by partially obstructing, opening or closing particular passageways. Valves are usually pipe fittings but are usually discussed as a separate category. In instances where an open valve is concerned, fluid flows in a direction from higher to lower pressure.
Many applications like military, industrial, residential, transport and commercial trades use valves. A few of the major trades which rely on valves comprise the oil and gas sector, mining, chemical manufacturing, power generation, water reticulation and sewerage.
Most valves being utilized in daily activities are plumbing valves, that are utilized in taps for tap water. Several common valves consist of ones 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 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 proper pumping action.
Valves can be worked in various ways. Like for example, they could be operated either by a pedal, a lever or a handle. Valves can be driven by changes in pressure, flow or temperature or they can be automatic. These changes could 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 making use of valves which need automatic control which is based on external input. For instance, 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 set-up and input, that allows the valve to be situated precisely while allowing control over different requirements.
