초록 ▼

A self-supporting modular underdrain member for use in a liquid filtration system comprises a main body or housing including a pair of longitudinally extending inclined walls which may have a pair of generally triangular transverse walls connecting the inclined walls to one another, the inclined wal

A self-supporting modular underdrain member for use in a liquid filtration system comprises a main body or housing including a pair of longitudinally extending inclined walls which may have a pair of generally triangular transverse walls connecting the inclined walls to one another, the inclined walls each being provided with a pair of longitudinally extending recesses and a plurality of orifices communicating with each of the recesses. A pair of flanges are connected to the inclined walls for attaching the underdrain body to a floor surface so that the inclined walls, any transverse walls and the floor surface define a cross-sectionally triangular underdrain chamber. Two pairs of elongate cover plates are attached to the inclined walls over the recesses to form in each of the inclined walls a pair of longitudinally extending plenums for the equalization of backwash air and water flow, each of the cover plates being provided with a plurality of spaced slots.

대표청구항 ▼

[ What is claimed is:] [1.] A self-supporting underdrain member for use in a liquid filtration system, comprising:first and second longitudinally extending, laterally spaced side wall means joined by a longitudinally extending upper wall means to form an interior chamber thereunder;at least one rece

[ What is claimed is:] [1.] A self-supporting underdrain member for use in a liquid filtration system, comprising:first and second longitudinally extending, laterally spaced side wall means joined by a longitudinally extending upper wall means to form an interior chamber thereunder;at least one recess wall defining a longitudinally extending recess having an upper side and a lower side along at least one of said side wall means, said at least one recess wall having a plurality of longitudinally spaced orifices therethrough between an inside and outside of the recess defined thereby;a first longitudinally extending groove associated with said side wall means adjacent one side of said recess;a second longitudinally extending groove associated with said side wall means adjacent another side of said recess, facing said first groove and substantially parallel to said first groove; anda substantially longitudinally extending cover plate having longitudinally spaced orifices therethrough having first and second lateral edges associated with said at least one side wall means including said recess wall, said cover plate having a first lateral edge received in said first longitudinally extending groove and a second lateral edge received in said second laterally extending groove, said cover plate defining, with said recess, a plenum on said at least one side wall means.