To discharge water accumulated in a water purifier by closing a air intake valve when the internal water pressure of a cartridge is large and opening the same when the internal water pressure is reduced while closing a drain valve when the internal water pressure of the cartridge is large and opening the same when the internal water pressure is reduced.
When tap water is allowed to flow in a water purifier, the interior of the water purifier is held to a pressurized state by water pressure and both of an air intake valve 20 and a residual water drain valve 30 are cut off so as to be isolated from the communication with the outside. Therefore, tap water is treated according to the regular route in the water purifier to be supplied. When the supply of tap water to the water purifier is cut off, water pressure is not applied to the interior of the water purifier and, therefore, both of the air intake valve 20 and the residual water drain valve 30 are opened to communicate with the outside. Herein, the whole of the water in the water purifier flows out of the residual water drain valve 30 and, since no water remains in the water purifier, the propagation of bacteria or the like in the water purifier is not generated.
| WO/1999/033551 | METHODS TO REMOVE METALS FROM WATER |
| JP3140992 | WATER PURIFIER |
| WO/2023/246738 | END SURFACE CONFLUENCE-TYPE FILTER ELEMENT ASSEMBLY AND FILTER ELEMENT |
INOUE KANJI
NEGISHI KOICHI
