Patent ID: 6241880
Filing Date: 2001-06-05
Classification: B01D,Y10T

Abstract:
A self-cleaning filter device for filtering particulate matter from liquid in a liquid stream which has a flow that periodically starts and stops, the filter device comprising:a housing having an intake passage interposed in the liquid stream, wherein the liquid stream is directed to flow into the intake passage;a main discharge passage in the housing communicating with the intake passage, the main discharge passage having a main discharge;a filter member mounted in the housing between the intake passage and the discharge passage, the filter member having an intake side and a discharge side;a by-pass discharge passage in the housing communicating with the intake passage and main discharge passage, the by-pass discharge passage having an opening proximate the filter member communicating with the intake passage on the intake side of the filter member;a valve at the opening of the by-pass discharge passage, wherein the valve has a valve member that closes the by-pass discharge passage at the beginning of liquid flow through the main discharge passage and opens the by-pass discharge passage at the end of liquid flow through the main discharge passage, wherein the by-pass discharge passage has a discharge and at the beginning and end of liquid flow through the main discharge passage, a portion of the liquid flow into the intake passage that does not flow through the filter member, flows through the by-pass discharge passage to the by-pass and wherein the valve member comprises a leaf valve, and wherein the housing includes a valve seat, wherein the leaf valve contacts the valve seat and closes the by-pass discharge passage in the manner of a flap valve.