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| Waterbed mattress |
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| Nodal point connection |
| OF THE INVENTION FIGS. 1, 2 and 5-18 show a spherical nodal body 10 of a nodal point connection ... |
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| Hermetic sealing of abutment joints by non-vacuum focused energy welding |
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| Method of making torsional vibration damper having a roll spun housing |
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Cap for underdrains in gravity filters
| Details |
Inventors: Brown, Marvin A.; Wolfe, Gerald D.; Beverly, Richard P.;
Assignee: The F. B. Leopold Company, Inc. (Zelienople, PA)
Primary Examiner: Silverman; Stanley S.
Assistant Examiner: Nessler; Cynthia L.
Attorney, Agent or Firm: Webb, Burden, Ziesenheim & Webb
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 overlying 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. |
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DETAILED DESCRIPTION In accordance with the invention, a cap for filter underdrain blocks is provided wherein the cap comprises a porous, planar body having a top surface, a bottom surface, a first lateral edge, a second lateral edge, a front edge and a rear edge, with a flange extending downward from each edge to a plane below the bottom surface.
A plurality of grooves are formed in the bottom surface, and means are included for securing the cap to a top wall of a filter underdrain block so that the bottom surface extends above a plurality of orifices in the top wall, with the flanges engaging the top wall.
The top surface thus supports the filter media, and the bottom surface along with the flanges define a distribution chamber above the orifices.
The body of the cap is adapted to support a fine grain filter media without the media penetrating therethrough, and the pores in the body are preferably about 700-800 microns in size.
The lower portion of each flange defines a sealant channel for receiving a sealing agent to seal a joint between the lower portion and the top wall, and the means for securing the cap to the top wall may comprise a plurality of screws extending through the projections, or the means may comprise magnetic induction fusion welds.
The grooves in the bottom surface may be longitudinal and may extend the length of the body.
The cap is preferably molded from sintered, polyethylene beads.
A capped filter underdrain block is also provided.
The block has a top wall, a bottom wall and two side walls extending between the top wall and the bottom wall.
The block has at least one conduit therethrough, and the top wall has a plurality of orifices in communication with that conduit.
There are also a plurality of ribs on the top wall forming a grid having a plurality of sectors, each sector encompassing at least one of the orifices.
The cap has a porous, planar resilient body with a top surface, a bottom surface, a first lateral edge, a second lateral edge, a front edge and a rear edge
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