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The Collaborative International Dictionary
Kingston valve

Kingston valve \King"ston valve\n. (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.

Wikipedia
Kingston valve

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 water to enter the tank.

The mechanism is named after its inventor John Kingston (1786-1847), an English engineer.