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Valves help to control the flow of a fluids such as liquids, slurries, fluidized gases or regular gases by partially obstructing, opening or even by closing certain passageways. Standard 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.
Many applications such as military, industrial, residential, transport and commercial industries make use of valves. 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 everyday activities are plumbing valves, that are used in taps for tap water. Various popular valves include those fitted to dishwashers and washing machines, gas control valves on cookers, valves inside car engines and safety devices fitted to hot water systems. In nature, veins inside the human body act as valves and control the blood circulation. Heart valves even control the flow of blood in the chambers of the heart and maintain the correct pumping action.
Valves can be worked in several ways. For instance, they could be worked either by a handle, a pedal or a lever. Valves could be driven by changes in flow, temperature or pressure or they could be automatic. These changes may act upon a diaphragm or a piston which in turn activates the valve. Some popular examples of this type of valve are found on safety valves or boilers fitted to hot water systems.
Valves are used in a lot of complicated control systems which can need an automatic control which is based on external input. Controlling the flow through the pipe to a changing set point is an example. These situations usually require an actuator. An actuator will stroke the valve depending on its set-up and input, allowing the valve to be situated accurately while enabling control over various requirements.
