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A valve is a device which controls the flow of a fluid like liquids, slurries, fluidized gases or regular gases, by closing, partially obstructing or opening particular passageways. Valves are usually pipe fittings but are typically discussed as a separate category. In cases where an open valve is concerned, fluid flows in a direction from higher to lower pressure.
Valves are utilized in various applications like for instance military, industrial, residential, transport and commercial trades. A few of the major industries that depend on valves include the mining, chemical manufacturing, power generation, water reticulation, sewerage and oil and gas sector.
Most valves being utilized in day to day activities are plumbing valves, that are utilized in taps for tap water. Other popular valves comprise those 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 inside the human body act as valves and regulate the blood flow. Heart valves even regulate the circulation of blood in the chambers of the heart and maintain the right pumping action.
Valves can be utilized and worked in lots of ways that they could be operated by a handle, a pedal or a lever. Furthermore, valves could be driven automatically or by changes in temperature, pressure or flow. These changes can act upon a diaphragm or a piston which in turn activates the valve. Several common examples of this kind of valve are found 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. For example, regulating flow through a pipe to a changing set point. These situations generally require an actuator. An actuator would stroke the valve depending on its input and set-up, allowing the valve to be places accurately while enabling control over a variety of needs.
