Filter element for pulse cleaning and methods
To improve in pulse cleaning of filters, a filter element includes a media pack of Z-media having first and second opposite flow faces and a side wall extending between the first and second flow face. A gasket is secured to the side wall. The gasket has a sealing portion and an attachment portion. The sealing portion has a flat surface at least one inch long and is located between being planar with and 0.5 inches recessed from the first flow face, inclusive.
1. A filter element comprising:
(a) a media pack comprising opposite first and second flow faces with flutes extending in a direction therebetween; a sidewall extending between the first and second flow faces;
(i) the first flow face being an outlet flow face, and second flow faces being an inlet flow face; and
(b) a gasket secured to the sidewall; the gasket having a sealing portion and an attachment portion; the sealing portion having a flat surface at least one inch long and being between planar with and 0.5 inches recessed from the first flow face, inclusive;
(i) the gasket defining an undercut between the attachment portion and the sealing portion;
(ii) the sealing portion including first and second angled surfaces slanting toward each other to meet at an apex;
(A) the first angled surface extending from the attachment portion to the apex;
(B) the second angled surface extending from the flat surface to the apex;
(C) the undercut being defined as a gap between the first angled surface and the attachment portion; and
(iii) the first angled surface and the attachment portion being joined by a base.
2. A filter element according to claim 1 wherein:
(a) the media pack is non-cylindrical.
3. A filter element according to claim 1 wherein:
(a) the media pack is oval shaped.
4. A filter element according to claim 1 wherein:
(a) the media pack is racetrack shaped having a pair of straight parallel sides joined by rounded ends.
5. A filter element according to claim 1 wherein:
(a) a vertical distance from the base to an end of the first angled surface is at least 0.5 inch.
6. A filter element according to claim 1 wherein the flat surface slopes downward and away from the first flow face at an angle of greater than 0 degrees and less than 20 degrees.
7. A filter element according to claim 1 wherein:
(a) the filter media is a coiled construction.
8. A filter element according to claim 1 further including:
(a) a handle member extending axially from the first flow face.
9. A filter element according to claim 8 further including:
(a) a central core; the media pack being coiled around the core; and
(b) the central core projects above the first flow face and defines a handle member for manipulating the filter element.