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Valves help to control the flow of a fluids like for example fluidized gases or regular gases, liquids, slurries by opening and closing or even by partially obstructing some 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.
Many applications like industrial, residential, transport, commercial and military industries utilize valves. A few of the main trades which rely on valves comprise the mining, chemical manufacturing, power generation, water reticulation, sewerage and oil and gas sector.
In daily activities, the most common valves are plumbing valves as seen in view of the fact that it taps for tap water. Various 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 regulate the blood flow. Heart valves also control the circulation of blood in the chambers of the heart and maintain the proper pumping action.
Valves can be used and worked in lots of ways that they can be worked by a lever, a handle or a pedal. Also, valves can be operated automatically or by changes in temperature, pressure or flow. These changes can act upon a piston or a diaphragm which in turn activates the valve. Various popular examples of this particular type of valve are seen on safety valves or boilers fitted to hot water systems.
There are more complicated control systems using valves that require automatic control that is based on external input. For instance, controlling flow through a pipe to a changing set point. These circumstances 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 enabling control over various requirements.