PROBLEM TO BE SOLVED: To reduce the chances of a flow channel being switched inadvertently.SOLUTION: A flow rate switching device (11) comprises: a holding body (21) which holds a first flow channel (7) and a second flow channel (8) with the first and second flow channels (7, 8) passing therethrough and has an opening (36) for operation a supported part (42) having a rotation center along a direction of the flow channels (7, 8) passing through the holding body blockage parts (43, 44) capable of blocking the flow channels (7, 8) as the supported part (42) rotates an engaging part (47) which is disposed within the opening (36) provided in the supported part (42) and engages a jig (49) inserted from the outside through the opening (36) and an operation part (46) for moving the supported part (42) among a position at which the first flow channel (7) is blocked, a position at which the second flow channel (8) is blocked, and a position at which the flow channels (7, 8) are opened.COPYRIGHT: (C)2015,JPO&INPIT【課題】誤って流路が切り替えられることを低減すること。【解決手段】第1の流路(7)と第2の流路(8)を貫通した状態で保持し、操作用の開口部(36)を有する保持体(21)と、流路(7,8)が貫通する方向に沿った回転中心を有する被支持部(42)と、被支持部(42)の回転に伴って流路(7,8)を閉塞可能な閉塞部(43,44)と、被支持部(42)に設けられ且つ開口部(36)の内部に配置され、開口部(36)を通じて外部から挿入された治具(49)が係合する係合部(47)を有し、第1の流路(7)を閉塞する位置と、第2の流路(8)を閉塞する位置と、流路(7,8)を開放する位置と、の間で被支持部(42)を移動させる操作部(46)と、を備えた流量切替装置(11)。【選択図】図2
