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Valves help to control the flow of a fluids like slurries, fluidized gases or regular gases, liquids by closing, partially obstructing or even by opening certain passageways. Typical valves are pipe fittings but are discussed as a separate category. In cases where an open valve is concerned, fluid flows in a direction from higher to lower pressure.
Numerous applications like for example residential, transport, commercial, military and industrial trades utilize valves. Some of the main trades that depend on valves comprise the oil and gas sector, mining, chemical manufacturing, power generation, water reticulation and sewerage.
Most valves being utilized in everyday activities are plumbing valves, which are used in taps for tap water. Various common valves comprise types 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 likewise control the flow of blood in the chambers of the heart and maintain the proper pumping action.
Valves could be used and operated in several ways that they can be operated by a pedal, a lever or a handle. In addition, valves can be operated 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. Various popular examples of this type of valve are found on safety valves or boilers fitted to hot water systems.
Valves are used in many complex control systems which can require an automatic control that is based on external input. Regulating the flow through the pipe to a changing set point is one 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 positioned accurately while enabling control over different requirements.
