| 摘要 |
PURPOSE: A modular filter assembly that incorporates a regulated surface cleaning mechanism that is capable of using a wide variety of filtration materials to provide various levels of rainwater treatment is provided. CONSTITUTION: The filter assembly(15) comprises a hood(20) that defines a plurality of voids(21) arranged in a horizontally-aligned array; a drain manifold(19); a filter disposed between the hood and the drain manifold; a drainage space(30) that is disposed between and in fluid communication with both the filter medium(31) and the drain manifold; and a check valve(34) that is configured to permit air to escape but not to enter the drainage space, such that a siphon can be established that draws additional fluid through the filter medium and into the drain manifold, the siphon continuing until air entering the hood via the plurality of voids disrupts the siphon, wherein the filter assembly further comprises a drain valve assembly within the drainage space, the drain valve assembly configured to permit a first rate of fluid flow from the drainage space to the drain manifold until the drainage space is filled with fluid to a specified depth, whereupon the drain valve assembly permits a second increased rate of fluid flow to the drain manifold, the second rate of fluid flow acting in combination with the siphon to draw additional fluid through the filter and into the drain manifold, and where disruption of the siphon restores the first rate of fluid flow. |
