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Valves help to regulate the flow of a fluids like for instance fluidized gases or regular gases, liquids, slurries by opening and closing or even by partially obstructing particular passageways. Standard 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 used in many applications such as commercial, military, industrial, residential and transport trades. A few of the major trades which depend on valves comprise the power generation, water reticulation, sewerage, oil and gas sector, mining and chemical manufacturing.
Most valves being used in daily activities are plumbing valves, that are utilized in taps for tap water. Other common valves consist of those fitted to dishwashers and washing machines, 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 regulate the blood circulation. Heart valves also control the circulation of blood in the chambers of the heart and maintain the right pumping action.
Valves can be operated in a variety of ways. Like for example, 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 can be automatic. These changes can act upon a piston or a diaphragm which in turn activates the valve. Some common examples of this particular type of valve are found on boilers or safety valves fitted to hot water systems.
There are more complex control systems making use of valves that need automatic control that is based on external input. Like for instance, controlling flow through a pipe to a changing set point. These situations normally require an actuator. An actuator would stroke the valve depending on its input and set-up, which enables the valve to be places precisely while enabling control over different needs.
