Patent ID: 6120683
Filing Date: 2000-09-19
Classification: B01D

Abstract:
A filter comprising:a housing having an inlet and an outlet;a filter core mounted for movement within the housing with the inlet and the outlet in fluid communication with opposite sides of the core, the filter core having opposed ends, a filter media carried between the opposed ends and with opposed ends being movable as a unit relative to the housing, and a pressure responsive surface in fluid communication with said inlet;a sleeve valve attached to the filter core and movable therewith into a sealing position to prevent fluid from passing to the outlet when the core moves within said housing in response to fluid pressure acting against said pressure responsive surface, said valve comprising a shut-off tube fixedly disposed about the outlet, said sleeve valve being reciprocally mounted on the shut-off tube and abutting the core, the sleeve valve moving along the shut-off tube towards the outlet when the core moves within the housing in response to fluid pressure acting against said pressure responsive surface;a spring for biasing the sleeve valve away from the outlet disposed between a first surface on the shut-off valve and a second surface on the sleeve valve; andthe second surface having a groove formed therein to secure an end of the spring to the sleeve valve.