A dispensing device for uniformly distributing gas and / or liquid in the culvert system of the culvert

摘要

The cowling system of the culvert, which is particularly suited as a gravity filter replacement, includes a scallop shell side tube (26,127) with a top, winding wire slotted screen surface (28). The screen surface supports and retains the filter medium particles 118 directly without the underlying gravel layer and is supported by the channeled rod member 34 welded to the wire 30. The web portion 36 of the channel-shaped rod member serves to simultaneously distribute air and water during backwashing, the total area of the upper channel gap 38 is small and the total area of the lower channel gap 40 is smaller Even if the plenum 56 is formed in the inside to make the side tube completely level, the distribution of air and water is uniformly distributed through the side tube. The distribution of air and water through the side tubes is provided by the provision of a perforated flow tube 122 extending from each side tube to the header to form an additional air plenum 135 and mounting of a side tube on the header 124 And becomes uniform.