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Valves aid to regulate the flow of a fluids like for instance liquids, slurries, fluidized gases or regular gases by closing, partially obstructing or even by opening particular passageways. Regular valves are pipe fittings but are 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 main trades which depend on valves consist of the mining, chemical manufacturing, power generation, water reticulation, sewerage and oil and gas sector.
Most valves being utilized in daily activities are plumbing valves, which are used in taps for tap water. Various common valves comprise ones fitted to washing machines and dishwashers, 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 control the blood circulation. Heart valves likewise regulate the flow of blood in the chambers of the heart and maintain the right pumping action.
Valves could be operated in various ways. For instance, they could be operated either by a handle, a pedal or a lever. Valves can be driven by changes in pressure, flow or temperature or they could be automatic. These changes may act upon a piston or a diaphragm which in turn activates the valve. Various popular examples of this particular type of valve are found on safety valves or boilers fitted to hot water systems.
There are more complicated control systems making use of valves that require automatic control which is based on external input. Like for instance, controlling flow through a pipe to a changing set point. These circumstances generally need an actuator. An actuator would stroke the valve depending on its input and set-up, which allows the valve to be situated accurately while enabling control over a variety of requirements.
