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A valve is a device that controls the flow of a fluid like for instance slurries, fluidized gases or regular gases, liquids, by partially obstructing, opening or closing particular passageways. Valves are generally pipe fittings but are typically discussed as a separate category. In instances where an open valve is concerned, fluid flows in a direction from higher to lower pressure.
Valves are used in numerous applications like for example transport, commercial, military, industrial and residential trades. A few of the main businesses which rely on valves comprise the oil and gas sector, mining, chemical manufacturing, power generation, water reticulation and sewerage.
Most valves being used in daily activities are plumbing valves, which are used in taps for tap water. Other common valves consist of kinds fitted to washing machines and dishwashers, gas control valves on cookers, valves within car engines and safety devices fitted to hot water systems. In nature, veins within the human body act as valves and control the blood circulation. Heart valves likewise control the circulation of blood in the chambers of the heart and maintain the proper pumping action.
Valves can be worked in various ways. Like for example, they can be operated either by a handle, a pedal or a lever. Valves could be driven by changes in pressure, flow or temperature or they can be automatic. These changes may act upon a piston or a diaphragm which in turn activates the valve. Several popular examples of this type of valve are found on safety valves or boilers fitted to hot water systems.
There are more complicated control systems using valves which require automatic control which is based on external input. Like for instance, regulating flow through a pipe to a changing set point. These situations generally need an actuator. An actuator would stroke the valve depending on its set-up and input, allowing the valve to be situated precisely while enabling control over various requirements.