Abstract: A filter arrangement which is employed in a fluid conduit is formed of a filter formed of a permeable filter material connected to a flange seal having an annular portion for engaging with and coupling to the permeable filter medium, and a planar portion for forming a seal which prevents leakage at a flange-type coupler. The planar and annular portions of the flange seal are formed of teflon, as is the filter itself, which may be formed of multiple layers of teflon fabric or filter material, each having a respective filter permeability characteristic. The filter is coupled to the annular portion of the flange seal by a thread which is sewn through the various layers of the filter medium and the annular portion of the flange seal. The thread may itself be formed of teflon, such that the entire filter arrangement is formed of teflon and will resist corrosion. Collapse of the filter is prevented by a rigid tubular support which has apertures therethrough to facilitate flow of the fluid.

Abstract: A rotary filter apparatus includes a tank for containing a slurry to be filtered. A rotary drum is mounted for rotation about a horizontal axis. The drum has a filter surface which extends into the slurry, so that the filtrate may be withdrawn from the interior of the drum. An agitator in the bottom of the tank includes a vane mounted below the drum for rotation about a horizontal axis. The vane is driven to reciprocate through a driven angle about its rotational axis.