Patent ID: 8313656

Claim:
A variable wash flow filter assembly comprising: a housing which defines an inlet along a longitudinal axis, at least one filtered flow port, and at least one thru flow port; a frusto-conical wash filter axially fixed within said housing adjacent to said at least one filtered flow port; a wash velocity control cone movable between a minimal position and a maximum position relative to said axially fixed wash filter; and a guide operable to guide said wash velocity control cone along said longitudinal axis between said minimal position and said maximum position, said guide defines at least one activation deltaP window downstream of a conical gap between said wash velocity control cone and said frusto-conical wash filter, the fuel flow through said conical gap and said at least one activation deltaP window operable to position said wash velocity control cone between said minimal position and said maximum position to selectively split a fuel flow through said inlet into a burn flow through said thru flow port and a filtered flow thru said frusto-conical wash filter and filtered flow port, and wherein said conical gap and, said at least one deltaP window provides a differential pressure between an outside of said wash velocity control cone and an inside of said wash velocity control cone.