The liquid purification apparatus (100) includes a reservoir (101) for the liquid (102) and a primary irradiation device (106, 301), and has a directional valve movable between a recirculation position and a discharge position, The liquid (102) passes through a circulation tube (105, 305, 501； 115, 306, 502) that is at least partially disposed within the primary irradiation device (106, 301) and is substantially transparent to ultraviolet light. When the flow, directional valve (107, 500) is in the recirculation position, the reservoir (101), the circulation pipe (105, 305, 501) and the directional valve (107, 500, 115, 306, 502) form a closed loop. . The present invention eliminates any dead space or dead corners from the device and prevents recontamination of the entire system. [Selection] Figure 1液体浄化装置（１００）は、液体（１０２）用のリザーバ（１０１）と、一次照射機器（１０６、３０１）とを備え、再循環位置と放出位置との間で可動の方向弁を有し、液体（１０２）は、一次照射機器（１０６、３０１）内に配置される少なくとも一部分が紫外線に対して実質的に透過性の循環管（１０５、３０５、５０１；１１５、３０６、５０２）を通って流れ、方向弁（１０７、５００）が再循環位置にあるとき、リザーバ（１０１）、循環管（１０５、３０５、５０１）、方向弁（１０７、５００、１１５、３０６、５０２）が閉ループを形成する。本発明は、装置からあらゆるデッドスペース又はデッドコーナを排除し、システム全体の再汚染も防ぐ。【選択図】図１
