PROBLEM TO BE SOLVED: To provide a liquid inlet port which prevents air bubbles from occurring and liquid from residing, can appropriately maintain cleanliness of a branch part and its surrounding area, and improves a cleaning effect by a cleaning fluid.SOLUTION: The liquid inlet port includes: a housing having a main channel including a fluid inflow passage and a fluid outflow passage and a branch channel a cap covering the outer periphery of an opening end side of the branch channel a valve body for controlling circulation between the main channel and the branch channel. In the fluid inlet port, a cylindrical channel is formed between an inner peripheral surface of the cap and an outer peripheral surface of the housing when the cap is mounted, a bypass path which is branched from the fluid inflow passage or the fluid outflow passage, goes through the cylindrical channel to communicate with the branch passage is formed, an opening/closing valve for blocking the leakage of fluid from the branch part to the outside of the housing is provided in the housing, a differential pressure generation part is provided in the fluid inflow passage or the fluid outflow passage, and a spiral groove is provided on at least one of the cap inner peripheral surface and the housing outer peripheral surface.COPYRIGHT: (C)2015,JPO&INPIT【課題】気泡の発生および流体の滞留が防止され、分岐部位およびその周辺の清浄度を適正に維持可能であり、洗浄液による洗浄効果を向上した採液ポートを提供する。【解決手段】流体流入路および流体流出路を含む主流路並びに分岐流路を有するハウジングと、分岐流路の開口端側外周を覆うキャップと、主流路と分岐流路との間の流通を制御する弁体とを備えた採液ポートであって、キャップ装着時に、キャップの内周面とハウジングの外周面との間に筒状流路が形成されるとともに、流体流入路または流体流出路から分岐して筒状流路を経由し分岐流路と連通するバイパス路が形成され、分岐部からハウジング外への流体の漏出を遮断する開閉弁をハウジングの内部に設け、流体流入路または流体流出路に差圧発生部を設け、キャップ内周面またはハウジング外周面の少なくとも一方に、螺旋状の溝を設けたことを特徴とする採液ポート。【選択図】図1
