Patent ID: 7122123

Claim:
A method of filtering a fluid with a filter assembly that includes a plurality of wave coils arranged axially to define a filter element having first and second ends and an inner cavity, a support engaging one of the first and second ends for supporting the wave coils, wherein each of the wave coils include at least one crest and at least one trough with the crest of one wave coil engaging the trough of an adjacent wave coil to define at least one filtration aperture between each crest and each trough of adjacent wave coils, a base plate engaging one of the first and second ends of the filter element, and a flange member engaging the other of the first and second ends relative to the base plate, wherein the flange member includes a flange collar and a yoke extending from the collar toward the base plate thereby defining a shoulder portion of the flange member between the flange collar and the yoke with the shoulder portion supporting the other of the first and second ends of the filter element relative to the base plate, said method comprising the steps of: adjusting the filter assembly to reduce and expand the at least one filtration aperture; flowing the fluid toward the support of the filter assembly; diverting the fluid inside or outside the inner cavity of the filter element; and filtering the diverted fluid through the at least one filtration aperture defined between each crest and each trough of adjacent wave coils such that a filtrate of the fluid passes through one of the inside or outside of the inner cavity and a retentate of the fluid is retained on the other of the inside or outside of the inner cavity relative to the filtrates, wherein the step of adjusting the filter assembly is further defined as adjusting the flange member relative to the base plate for modifying a length L, which extends between the first and second ends of the filter element, to reduce and expand the at least one filtration aperture, and wherein the step of adjusting the flange member is further defined as biasing the yoke to decrease and increase the length L.