Patent ID: 7467636

Claim:
A dishwasher comprising: a tub including bottom, opposing side, rear and top walls which collectively define a washing chamber adapted to receive soiled kitchenware and a supply of washing fluid; at least one wash arm adapted to spray the washing fluid onto the kitchenware; a recirculation pump adapted to supply the at least one wash arm with the washing fluid; a first filter unit fluidly interposed between the tub and the recirculation pump; a first filter chamber arranged below the bottom wall of the tub; a second filter unit fluidly interposed between the tub and the first filter chamber through which the washing fluid, with entrained soil particles, enters the first filter chamber; a first soil collection chamber opening to the first filter chamber, said first soil collection chamber being adapted to receive the soil particles flowing through the second filter unit; a third filter unit interposed between the first filter chamber and the recirculation pump; a second filter chamber spaced from the first filter chamber; a fourth filter unit interposed between the second filter chamber and the tub; a conduit fluidly interconnecting the recirculation pump with the at least one wash arm, said conduit extending through the second filter chamber and including a bleed port opening into the second filter chamber; a second soil collection chamber opening to the second filter chamber, said second soil collection chamber being adapted to receive soil particles filtered from the washing fluid by the fourth filter; and a valve assembly separating the second soil collection chamber from the first soil collection chamber, said valve assembly including a seal member and a pivot arm adapted to open the seal member during a drain portion of a washing operation.