Patent ID: 9561455
Date: 2017-02-07
CPC Classifications: B01D

Claim:
1. A fluid filter device comprising: a primary filter section having a first porous section; a secondary filter section having a second porous section; a first cleaning element to remove fouling materials from the first porous section of the primary filter section; and a fluid backwash valve element operable between: (i) a closed position in which fluid flow is in a direction from the first porous section to the second porous section, and (ii) an open position wherein at least a portion of fluid flow is in a direction from the second porous section to the first porous section, wherein: (i) the primary filter section and the secondary filter section are in fluid communication with one another, and (ii) the first porous section has a greater porosity than the second porous section, and wherein the backwash valve element is configured to be moved to the open position upon being contacted by the first cleaning element.