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A valve is a device that regulates the flow of a fluid like for instance liquids, slurries, fluidized gases or regular gases, by partially obstructing, opening or closing certain passageways. Valves are generally pipe fittings but are usually 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 military, industrial, residential, transport and commercial businesses make use of valves. Some of the main businesses that rely on valves comprise the water reticulation, sewerage, oil and gas sector, mining, chemical manufacturing and power generation.
Most valves being utilized in daily activities are plumbing valves, that are used in taps for tap water. Several common valves include 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 control the blood circulation. Heart valves also regulate the circulation of blood in the chambers of the heart and maintain the right pumping action.
Valves can be operated in several ways. Like for example, they can be worked either by a lever, a handle or a pedal. Valves could be driven by changes in temperature, pressure or flow or they can be automatic. These changes could act upon a piston or a diaphragm which in turn activates the valve. Several common examples of this type of valve are seen on boilers or safety valves fitted to hot water systems.
There are more complex control systems utilizing valves which require automatic control which is based on external input. For example, regulating flow through a pipe to a changing set point. These circumstances usually require an actuator. An actuator would stroke the valve depending on its set-up and input, allowing the valve to be situated accurately while allowing control over a variety of needs.
