🌐EnglishEnglishFrançaisSvenskaTürkçeРусскийالعربيةEntityQ2657372· pop 12· linked from 29 articlessun valvevalve used to automatically control gas flow in lighthousesWikidata factsImageSun valve designed by Gustaf Dalen, 1912, turns lighthouse on at night and off during the day, TM34299 - Tekniska museet - Stockholm, Sweden - DSC01443.JPGSources (1)wikidata.orgvia Wikidata · CC0Available in 11 languagesFrançaisРусскийالعربيةCzechFinnishMacedonianNorwegianSvenskaTürkçeUkrainianvia Wikidata sitelinks · CC0ConnectionsThomas EdisonEntitylighthouseEntityCategoriesValves