Patent ID: 7850845
Filing Date: 2010-12-14
Classification: F02M

Abstract:
1. A filter with installation integrity comprising a housing containing a filter element, said housing having an inlet and an outlet and defining a fluid flow path through said filter element between said inlet and said outlet, said filter having a first installation condition providing desired filter integrity, and having a second installation condition, said fluid flow path including a fluid flow duct having a magnetically biased piston movable between a first position permitting fluid flow through said duct between said inlet and said outlet, and a second position at least partially blocking fluid flow through said duct between said inlet and said outlet, wherein said piston is in said first position when said filter is in said first installation condition, and wherein said piston is in said second position when said filter is in said second installation condition, wherein, said duct comprises a cage supporting and guiding said piston for movement between said first and second positions; one of said housing, said filter element and said cage has a magnetic actuation section proximate to and magnetically coupled to said piston when said filter is in said first installation condition, with magnetic coupling providing sufficient magnetic force to move said piston to said first position; said magnetic coupling is missing in said second installation condition, whereby there is insufficient magnetic force to move said piston to said first position, wherein, said magnetic actuation section comprises a magnet; said piston comprises magnetically permeable material, wherein, said magnet is movably mounted to said cage, and in said first installation condition is moved to an actuated position proximate to and magnetically coupled to said piston.