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Valves aid to regulate the flow of a fluids such as slurries, fluidized gases or regular gases, liquids by closing, partially obstructing or even by opening particular passageways. Regular valves are pipe fittings but are 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 various applications such as military, industrial, residential, transport and commercial trades. Some of the major businesses which depend on valves comprise the chemical manufacturing, power generation, water reticulation, sewerage, oil and gas sector and mining.
Most valves being utilized in everyday activities are plumbing valves, which are utilized in taps for tap water. Other common valves comprise kinds fitted to washing machines and dishwashers, 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 circulation. Heart valves even control the flow of blood in the chambers of the heart and maintain the right pumping action.
Valves could be utilized and worked in many ways that they could be worked by a handle, a pedal or a lever. Furthermore, valves could be driven automatically or by changes in pressure, flow or temperature. These changes can act upon a diaphragm or a piston which in turn activates the valve. Several popular examples of this type of valve are found on boilers or safety valves fitted to hot water systems.
There are more complicated control systems making use of valves which require automatic control that is based on external input. Like for instance, regulating flow through a pipe to a changing set point. These circumstances usually require an actuator. An actuator would stroke the valve depending on its set-up and input, allowing the valve to be situated precisely while enabling control over a variety of needs.