| 摘要 |
A venting and filtering system for minimizing pressure differentials between the interior and exterior of a liquid storage tank while precluding ingress of contaminants into such tank. More specifically, a closure assembly for closing the access manhole in a liquid storage tank-e.g., a tank trailer suitable for transporting a comestible liquid product such as milk-including an upstanding tubular wall defining a vertical passage extending through the closure assembly, a sheet of filter material seated on the wall and extending entirely across the passage, and a dome-shaped cover seated on the upstanding wall and projecting rearwardly therefrom so as to define a downwardly facing vent with the vent, dome-shaped cover and passage defining a tortuous path extending entirely through the closure assembly, and wherein the dome-shaped cover is removably or pivotally secured to the closure assembly so as to permit ease of replacement of the sheet of filter material.
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