| 摘要 |
A collecting and treating tank which holds liquid and in which a vertically movable cover floats on the liquid or on a gas layer above the liquid, comprising a tank having a vertical cylindrical circular wall, a bottom at and joined to the wall, and a circular cover which fits loosely inside the circular wall so that it is vertically displaceable with change in liquid and/or gas volume beneath the cover; and a plurality of cover guides, spaced radially around the cover edge, which are adapted to maintain the cover periphery spaced from the tank wall; said cover guides being faced with a solid polymeric layer which is slippery and has a low coefficient of friction so that the cover is readily displaceable vertically solely with change in volume of liquid, gas or both beneath the cover.
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