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Valves aid to regulate the flow of a fluids such as fluidized gases or regular gases, liquids, slurries by partially obstructing, opening or even by closing some passageways. Standard valves are pipe fittings but are discussed as a separate category. In situations where an open valve is concerned, fluid flows in a direction from higher to lower pressure.
Many applications like military, industrial, residential, transport and commercial businesses make use of valves. A few of the major industries which depend on valves include the oil and gas sector, mining, chemical manufacturing, power generation, water reticulation and sewerage.
In every day activities, the most common valves are plumbing valves as seen for the reason that it taps for tap water. Various common examples comprise small valves 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 can be operated in various ways. For instance, they can be operated either by a pedal, a lever or a handle. Valves could be driven by changes in pressure, flow or temperature or they can be automatic. These changes can act upon a piston or a diaphragm which in turn activates the valve. Various popular examples of this type of valve are seen on safety valves or boilers fitted to hot water systems.
There are more complex control systems utilizing valves which need automatic control which is based on external input. Like for instance, 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 places precisely while allowing control over several needs.