Patent ID: 6942796
Filing Date: 2005-09-13
Classification: B01D

Abstract:
1. A prefilter comprising: a filter housing having an inlet in a bottom portion thereof for receiving an inflow of liquid to be filtered and an outlet in a top portion thereof for discharging an outflow of filtered liquid; a lower filter unit located in the bottom portion of the housing, comprising: a reception chamber in the filter housing in fluid communication with the inlet of the housing and with the inlets of the lower filter unit, the liquid to be filtered entering the housing via the inlet thereof and flowing across the reception chamber to enter the inlets of the lower filter unit; and the filtered liquid discharged at the outlets of the lower filter unit flowing across the discharge chamber towards the outlet of the filter housing; an upper filter unit located in the top portion of the housing on top of the lower filter unit for further filtering liquid previously filtered in the lower filter unit, the upper filter unit comprising: a discharge chamber for the upper filter unit located in the top portion of the filter housing around said upper filter unit, the discharge chamber being in fluid communication with the outlet of each of the passages of the upper filter unit and with the outlet of the housing; wherein the reception chamber of the lower filter unit is hermetically separated from the discharge chamber of the upper filter unit; and wherein the filter units are vertically mounted in the filter housing.