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Valves assist to regulate the flow of a fluids like fluidized gases or regular gases, liquids, slurries by opening and closing or even by partially obstructing particular passageways. Typical 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.
Valves are utilized in various applications like residential, transport, commercial, military and industrial trades. Some of the major businesses that rely on valves include the water reticulation, sewerage, oil and gas sector, mining, chemical manufacturing and power generation.
Most valves being used in daily activities are plumbing valves, which are used in taps for tap water. Several common valves comprise types fitted to dishwashers and washing machines, gas control valves on cookers, valves in car engines and safety devices fitted to hot water systems. In nature, veins inside the human body act as valves and control the blood circulation. Heart valves even regulate the flow of blood in the chambers of the heart and maintain the proper pumping action.
Valves can be operated in several ways. Like for example, they could be operated either by a lever, a handle or a pedal. Valves could be driven by changes in pressure, flow or temperature or they can be automatic. These changes could act upon a diaphragm or a piston which in turn activates the valve. Several popular examples of this type of valve are seen on safety valves or boilers fitted to hot water systems.
Valves are utilized in a lot of complex control systems that could require an automatic control which is based on external input. Regulating the flow through the pipe to a changing set point is one example. These circumstances usually need an actuator. An actuator would stroke the valve depending on its set-up and input, allowing the valve to be places accurately while allowing control over different needs.
