Patent ID: 7273550

Claim:
A filter assembly comprising: a plastics housing having an interior, an exterior, an inlet, and an outlet; a filter element in the interior of the housing and including a filter medium; a passage extending between the interior and the exterior of the housing, the passage being separate from the inlet and the outlet; a valve including a valve member and a rotatable sleeve, wherein the valve member is located within the passage and is movable between a first position in which fluid flow along the passage is permitted and a second position in which the valve member seals the passage and fluid flow along the passage is prevented, wherein the valve member moves axially between the first and second positions in response to rotation of the sleeve, and wherein the valve further includes a pin and a slot which receives the pin, the engagement of the pin in the slot causing the valve member to move axially between the first and second positions in response to rotation of the sleeve; wherein the housing further includes an outwardly extending port having an open end and the passage extends through the housing port to the open end, the housing port defining first and second portions of the passage, wherein the valve member and the sleeve are connected, the valve member having a blind end and extending into the passage from the open end of the housing port, and the sleeve surrounds an exterior of the housing port, and wherein the pin and the slot are arranged with the sleeve and the exterior of the housing port to move the sleeve axially along the exterior of the housing port in response to rotation of the sleeve; and first and second O-ring seals, wherein the first O-ring seal seals the valve to the housing port in the first position and the second O-ring seal seals the blind end of the valve member to the housing port in the second position.