Abstract: A filter cartridge including a housing having a water inlet and outlet, a valve disposed in the housing and defining transversally aligned inlet and outlet passageways, and having a first key formation that vertically depends from the valve, a cartridge having transversely separated inlet and outlet ports transversely aligned relative to a longitudinal axis of the cartridge, each of the ports engageable in a corresponding one of the passageways, and a complementary key formation for engaging the first key formation for ensuring proper engagement of the ports in the passageways where the ports and the key formation project from a common plane. The valve is rotatable in the housing 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.

Abstract: The present invention provides a purifying apparatus, which is comprised of a mounting head, a reversing valve and a filter, wherein the mounting head has an inlet for connecting to the water supply pipes; said reversing valve includes a valve seat and a valve cartridge, therein the valve seat is fastened on the mounting head coordinating to the inlet and outlet, and the valve cartridge is set on the seat swinging between the valve seat and the mounting head coordinating to the inlet and the outlet of the mounting head; the replaceable filter is secured on the mounting head so as to mate the inlet and outlet of the filter to the inlet and outlet of the mounting head exactly, and by turning the filter the valve cartridge can be turned for controlling the inlet of the mounting head cutting in or off the inlet of the valve seat; and the inlet of the filter housing is connected to the outside wall of the filter element, and the outlet of it is connected to the center of the filter element; as tending to replace t