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A device for filtering a liquid, in particular for filtering a polymer plastic melt, has a housing which includes an inlet channel, a connecting channel situated in a shaft and a discharge channel, as seen in the flow direction of the liquid to be filtered, where the connecting channel has at least

A device for filtering a liquid, in particular for filtering a polymer plastic melt, has a housing which includes an inlet channel, a connecting channel situated in a shaft and a discharge channel, as seen in the flow direction of the liquid to be filtered, where the connecting channel has at least two filters arranged side by side and aligned across the flow direction of the liquid in the connecting channel, and the shaft is mounted in a bore in the housing so that it is axially displaceable and is liquid-tight, so that by axial displacement of the shaft, the two filters can be moved between a filtration position in which the inlet channel is connected to the discharge channel through the connecting channel, and an externally accessible cleaning position in which the connection from the inlet channel to the discharge channel is interrupted, and vice versa. As seen in the flow direction (10) of the liquid to be filtered, the connecting channel (4) has a first area (4a), which is arranged directly upstream from the filters (9a, 9b) and forms a single common liquid distribution space (4a) for the two filters (9a, 9b). Immediately following the first area (4a), there is a second area (4b) where the two filters (9a, 9b) are arranged side by side, so that the two filters (9a, 9b) partially overlap, whereby the first area (4a) and the second area (4b) of the connecting channel (4) having a cross section, as seen normal to the flow direction of the liquid to be filtered, which corresponds in shape to the shape of two overlapping circles.

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A device for filtering a liquid, in particular for filtering a polymer plastic melt, has a housing which includes an inlet channel, a connecting channel situated in a shaft and a discharge channel, as seen in the flow direction of the liquid to be filtered, where the connecting channel has at least

A device for filtering a liquid, in particular for filtering a polymer plastic melt, has a housing which includes an inlet channel, a connecting channel situated in a shaft and a discharge channel, as seen in the flow direction of the liquid to be filtered, where the connecting channel has at least two filters arranged side by side and aligned across the flow direction of the liquid in the connecting channel, and the shaft is mounted in a bore in the housing so that it is axially displaceable and is liquid-tight, so that by axial displacement of the shaft, the two filters can be moved between a filtration position in which the inlet channel is connected to the discharge channel through the connecting channel, and an externally accessible cleaning position in which the connection from the inlet channel to the discharge channel is interrupted, and vice versa. As seen in the flow direction (10) of the liquid to be filtered, the connecting channel (4) has a first area (4a), which is arranged directly upstream from the filters (9a, 9b) and forms a single common liquid distribution space (4a) for the two filters (9a, 9b). Immediately following the first area (4a), there is a second area (4b) where the two filters (9a, 9b) are arranged side by side, so that the two filters (9a, 9b) partially overlap, whereby the first area (4a) and the second area (4b) of the connecting channel (4) having a cross section, as seen normal to the flow direction of the liquid to be filtered, which corresponds in shape to the shape of two overlapping circles. ttle container to the wall surface of the joint part, also extending from the filler port to the inside of the bottle container; and an airflow control means for controlling air flowing into said bottle, the airflow control means being provided on the vent tube and further comprising either: a supplementary tube made of an elastic material which can enlarge and reduce an air passage of said vent tube; or an air flow regulating valve which can be engaged with an edge of an opening of said vent tube. 2. A water purifier as recited in claim 1 wherein an air inlet of the said vent tube can be adjusted in accordance with a desired purified water level. 3. A water purifier as recited in claim 1 further comprising an air chamber provided at a midpoint of said vent tube and being able to enlarge the air passage of said vent tube. 4. A water purifier as recited in claim 3 wherein said vent tube is movably connected, and comprises upper and lower tubes, the upper and lower tubes being able to be separated from each other at a lower position of said air chamber. 5. A water purifier as recited in claim 1 wherein said vent tube comprises an inflected part being able to prevent water from flowing back into the bottle container. 6. A water purifier as recited in claim 1 wherein an air outlet of the vent tube is gradually reduced in diameter toward an end thereof. 7. A water purifier as recited in claim 1 wherein said filter case comprises wing plates which can be opened and closed to a nearly horizontal position from a position adjacent to a side of said filter case. 8. A water purifier as recited in claim 1 wherein a funnel is provided on a downstream side of said filter case so that the purified water collects at a water supply hole thereof and flows downward. 9. A water purifier as recited in claim 1 wherein porous media is provided on an air outlet of said vent tube. 10. A water purifier as recited in claim 1 wherein a check valve is provided on an air inlet of said vent tube.