
A Kingston valve is a type of valve fitted in the bottom of a ship`s plating that connects the sea to the ship`s piping and storage tanks. A Kingston valve is a type of seacock. It is arranged so that, under normal operating conditions, sea pressure keeps the valve closed. When opened from the ship`s interior, the Kingston valve allows sea wate......
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http://en.wikipedia.org/wiki/Kingston_valve

• A conical valve, opening outward, to close the mouth of a pipe which passes through the side of a vessel below the water line.
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http://thinkexist.com/dictionary/meaning/kingston_valve/
King'ston valve (Marine Steam Engin.) A conical valve, opening outward, to close the mouth of a pipe which passes through the side of a vessel below the water line.
Found on
http://www.encyclo.co.uk/webster/K/11
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