PROBLEM TO BE SOLVED: To provide a drip tube having appropriate flow control.SOLUTION: A flow control system includes a drip tube containing a lower wall part partition, an upper wall part partition, and a collapsible wall part extending between the lower wall part partition and the upper wall part partition, a valve seat being hanging downward which is attached to the lower wall part partition, and a valve member which is arranged at the drip tube, to be attached to the upper wall part partition, containing a valve surface capable of engaging with the valve seat. The flow control system includes a drive body which is rotatably engaged with the upper wall part partition and the lower wall part partition. When the drive body is rotated in a first direction, the collapsible wall part of the drip tube moves between a collapsed state in which the valve seat engages with the valve surface in a closed state and an expanded state in which the valve seat sufficiently separates from the valve surface to form a fluid passage between the valve surface and the valve seat, to allow flow in an opening part of the drip tube.COPYRIGHT: (C)2015,JPO&INPIT【課題】好適な流れ制御を有する点滴筒を提供すること。【解決手段】流れ制御システムは、下方壁部区画、上方壁部区画、下方壁部区画と上方壁部区画との間に延在する折り畳み可能な壁部を有する点滴筒と、下方壁部区画に取り付けられた、下向きに垂れ下がる弁座と、点滴筒に配置され、上方壁部区画に取り付けられ、且つ弁座と係合可能な弁表面を有する弁部材とを含む。流体制御システムは、上方壁部区画および下方壁部区画に回転可能に係合された駆動体も含む。駆動体を第1方向に回転すると、点滴筒の折り畳み可能な壁部は、弁座が弁表面と密閉状態で係合する折り畳み状態と、弁座が弁表面から十分に離間して弁表面および弁座の間に流体流路が形成され点滴筒の開口部を通る流れが可能になる拡張状態との間で動く。【選択図】図4
