| 摘要 |
A deck drain for draining liquids from a floating roof of a liquid product storage tank includes a hollow drain tube extending downwardly from the deck of the floating roof at an upper open end thereof and a check valve assembly coupled to the upper open end of and having a cage extending upwardly from the upper open end of the drain tube. An elastomeric ball is slideably disposed within the cage and operative to seat within and close off the upper open end of the drain tube when in a lowermost position. The cage is comprised of a plurality of parallel, spaced-apart rods extending between an upper plate and a lower plate disposed on the deck and which is bolted through the deck to an opposite third plate which mounts the upper open end of the drain tube. The check valve assembly closes off the upper open end of the drain tube except when liquid is present on the deck.
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