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A valve is a device that controls the flow of a fluid like for example fluidized gases or regular gases, liquids, slurries, by closing, partially obstructing or opening some passageways. Valves are normally pipe fittings but are commonly discussed as a separate category. In cases where an open valve is concerned, fluid flows in a direction from higher to lower pressure.
Many applications like for instance transport, commercial, military, industrial and residential businesses make use of valves. A few of the major businesses which depend on valves comprise the oil and gas sector, mining, chemical manufacturing, power generation, water reticulation and sewerage.
Most valves being used in daily activities are plumbing valves, which are used in taps for tap water. Other popular valves consist of ones 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 circulation. Heart valves likewise control the flow of blood in the chambers of the heart and maintain the proper pumping action.
Valves can be worked in a variety of ways. Like for example, they could be worked either by a pedal, a lever or a handle. Valves can be driven by changes in flow, temperature or pressure or they can be automatic. These changes could act upon a piston or a diaphragm which in turn activates the valve. Several popular examples of this particular kind of valve are found on boilers or safety valves fitted to hot water systems.
There are more complicated control systems using valves that need automatic control which is based on external input. For example, controlling flow through a pipe to a changing set point. These circumstances generally require an actuator. An actuator would stroke the valve depending on its input and set-up, allowing the valve to be situated accurately while allowing control over various needs.
