FILTER CARTRIDGE AND HEAD ASSEMBLY WITH INTERNAL SHUTOFF VALVE

摘要

A filter assembly includes a head housing (14) having a water inlet (26) and a water outlet (28), and a valve (42) disposed in the housing and defining inlet and outlet passageways (44, 46), and having a first key formation (48). A cartridge (62) is provided having separate inlet and outlet ports (86, 88) each engageable in a corresponding one of the passageways, and a complementary key formation (90) for engaging the first key formation (48) for ensuring proper engagement of the ports in the passageways. The valve (42) is rotatable in the housing (14) between an open position in which feed water passes through the inlet passageway and into the cartridge, and treated water flows to the outlet passageway, and a closed position in which water is prevented from flowing to and from the valve. The inlet and outlet passageways and the first key formation are generally linearly aligned.