Light Valve

From International Dictionary of Marine Aids to Navigation
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Alternative term: Sun Valve

A device, operated by daylight, that automatically lights and extinguishes a gas light, usually lighting it at or about sunset and extinguishing it at or about sunrise.

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM