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Valves help to regulate the flow of a fluids like for instance liquids, slurries, fluidized gases or regular gases by closing, partially obstructing or even by opening some 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.
Valves are utilized in numerous applications like for instance residential, transport, commercial, military and industrial businesses. A few of the main businesses which depend on valves consist of the power generation, water reticulation, sewerage, oil and gas sector, mining and chemical manufacturing.
Most valves being used in daily activities are plumbing valves, which are used in taps for tap water. Several common valves include kinds 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 in the human body act as valves and regulate the blood flow. Heart valves even control the flow of blood in the chambers of the heart and maintain the right pumping action.
Valves can be worked in various ways. For example, they could be operated either by a handle, a pedal or a lever. Valves can be driven by changes in temperature, pressure or flow or they could be automatic. These changes can act upon a piston or a diaphragm which in turn activates the valve. Various popular examples of this particular kind of valve are seen on safety valves or boilers fitted to hot water systems.
Valves are used in various complex control systems that may need an automatic control that is based on external input. Regulating the flow through the pipe to a changing set point is an example. These situations generally require an actuator. An actuator would stroke the valve depending on its input and set-up, that allows the valve to be situated precisely while allowing control over several requirements.