Patent ID: 7517452

Claim:
A filter assembly including: a hollow body through which a fluid is to pass, the body having an inlet and an outlet downstream from the inlet; a filter member removably located within the body to filter fluid passing from the inlet to the outlet; a valve seat downstream of the filter member and providing a passage through which the fluid is to pass; a movable obstruction member movable relative to the seat between a first position engaging the seat to at least inhibit flow of the fluid through the seat passage to thereby retain solids, and a second position spaced upstream of said seat to provide for the flow of fluid and solids through the seat passage; and wherein said filter member and said obstruction member are magnetically attracted so that when said filter member is located within said body said obstruction member is attracted to said filter member so that said obstruction member moves to said second position, while when said filter member is not located in said body said obstruction member moves to the first position thereof.