Valve
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A valve is a device that it is used to decrease or stop the flow of a fluid (like gases, liquids, fluidized solids, or slurries). It can be installed for example in a pipe or a vessel.
There are many types of valves. Some examples are:
They can be operated manually or automatically.
Valve Media
Cross-sectional diagram of an open globe valve. Template:Olist*
The shut off butterfly valve for a Francis turbine at Gordon Power Station, Tasmania
A seacock for cooling seawater, on a marine diesel engine. Seacocks are usually ball valves, but may be other types as well.
A sailor aboard a ship operates the wheel controlling a fuel valve.