US 5,632,891 A · Self venting septums for use in a liquid filtration system

Abstract

A septum adapted to be pre-coated with a filter and/or chemical treatment composition is formed of a tubular core member having a top and a bottom end. A plurality of top openings is provided in the core member immediately adjacent to the top end. A short actual length portion of the tubular core is impervious adjacent to the plurality of the top opening. The balance, extending for the major portion of the length of the tubular core is perforated. A multi-layer filter screen is positioned about the exterior of the tubular core. A tubular air release shield is positioned on the filter screen having a length to substantially extend from the tubular core top to cover the top openings in the tubular core and the tubular core impervious portion. A vent opening is provided in the air release shield. An end fitting closes the top end of the tubular core. Air entrapped within the septum is vented through the tubular core top openings and the air release shield to prevent air entrapment within the septum and to augment more effective precoating of the septum.

Claims12

Dependent claims

A septum adapted to be pre-coated with a filter and/or chemical treatment composition comprising:

a tubular core member having a top end and a bottom end, having a plurality of top openings therein immediately adjacent said top end, having a short axial length impervious portion adjacent said plurality of top openings and a perforated portion from said impervious portion to said bottom end;
a multi-layer filter screen positioned about the exterior of said tubular core;
a tubular air release shield positioned on said filter screen having a tubular sidewall with at least one opening therethrough, the sidewall extending from said tubular core top towards said tubular core bottom of a length sufficient to at least substantially encompass said tubular core impervious portion;
and
an end fitting closing said top end of said tubular core whereby at least a substantial portion of gas entrapped in the septum is vented through said tubular core top openings and said air release shield at least one opening.

2 more elements

For use in a liquid filtration system having a filter tank, a plate separating said tank into an upper influent compartment and a lower filtrate compartment, a plurality of spaced apart vertically supported septums mounted in said influent compartment, and pre-coat means including means for distributing pre-coat particles on said septums, each said septum comprising:

a tubular core member having a top end and a bottom end, having a plurality of top openings therein immediately adjacent said top end, having a short axial length impervious portion adjacent and below said plurality of top openings and a perforated portion extending from said impervious portion downwardly to said bottom end;
a multi-layer filter screen positioned about the exterior of said tubular core;
a tubular air release shield positioned on said filter screen having a tubular sidewall with at least one opening therethrough, the sidewall extending from said tubular core member top towards said tubular core member bottom of a length sufficient to at least substantially encompass said tubular core member impervious portion;
and
an end fitting closing said top end of said tubular core whereby at least a substantial portion of gas entrapped in the septum is vented through said tubular core top openings and said air release shield at least one opening.

2 more elements

Dependencies are inferred from the claim text.

Self venting septums for use in a liquid filtration system

Life of this patent

Self venting septums for use in a liquid filtration system

Life of this patent

Abstract

Claims12