Richard P Beverly

US Patent:

52699200, Dec 14, 1993

Filed:

Sep 21, 1992

Appl. No.:

7/948259

Inventors:

Marvin A. Brown - Sewickley PA
Richard P. Beverly - Clackamas OR

Assignee:

The F. B. Leopold Co., Inc. - Zelienople PA

International Classification:

B01D 2422

US Classification:

210274

Abstract:

An improved cap for underdrains in gravity filters has a top surface and a bottom surface with a plurality of tapered screen members defining slots in the top surface. The slots provide communication with the filter bed without passage of fine grain filter media therethrough. The screen members are inclined with respect to horizontal to define a plurality of raised portions in the top surface, each raised portion defining a distribution chamber above the orifices in the distributor. The cap may be included in a capped filter underdrain block having a plurality of ribs and orifices on a top wall of the block. The cap rests on the ribs and cooperates with them to define distribution chambers above the orifices in the top wall of the block. The distribution chambers promote intermixing of air and water prior to introduction to the bed, and the ribs finely meter backwash fluids for even distribution of backwash fluids throughout the entire filter bed.

US Patent:

51494272, Sep 22, 1992

Filed:

Apr 3, 1991

Appl. No.:

7/679947

Inventors:

Marvin A. Brown - Sewickley PA
Gerald D. Wolfe - Zeliepnople PA
Richard P. Beverly - Butler PA

Assignee:

The F.B. Leopold Company, Inc. - Zelienople PA

International Classification:

B01D 2422

US Classification:

210274

Abstract:

A cap for filter underdrain blocks is provided, wherein the cap has a porous body with a top surface, a bottom surface and downwardly extending flanges. The cap is installed on a filter block having a plurality of orifices in a top wall of the filter block for channelling fluids to and from an overyling filter media. The bottom surface of the cap along with the flanges define a distribution chamber above the orifices, and the cap has a porosity such that a fine grain filter media may be placed directly on the top surface of the cap without media penetrating therethrough and clogging the underdrain blocks. The distribution chamber enhances distribution of backwash fluids throughout the filter media, and the cap eliminates the need for a separate gravel support layer to be installed between the fine grain filter media and the underdrain blocks.