PROBLEM TO BE SOLVED: To provide a three-way cock capable of preventing the stagnation of a liquid chemical in the switching path of a valve body and suppressing the administration error and concentration change of the liquid chemical.SOLUTION: The three-way cock comprises a cylindrical base part 2, three branching pipes 3, 4 and 5 extending from the base part 2, and a columnar valve body 7 provided inside the base part 2. The valve body 7 is provided with the switching path 8 for selectively communicating the respective branching pipes with each other by the turning. The switching path 8 comprises a through-hole 8a passing through the valve body 7 and an outer peripheral groove 8b extended in a semicircular shape along one side of the peripheral wall of the valve body 7 from one end of the through-hole 8a to the other end to be freely communicated selectively to the respective branching pipes 3, 4 and 5 in the state of being communicated with the through-hole 8a.COPYRIGHT: (C)2009,JPO&INPIT【課題】弁体の切換路における薬液の滞留を防止して、薬液の投与誤差や濃度変化を抑制することができる三方活栓を提供する。【解決手段】円筒状の基部2と、基部2から延出する3つの分岐管3,4,5と、基部2内に設けられた円柱状の弁体7とを備える。弁体7に、その回動により各分岐管同士を選択的に連通させる切換路8を設ける。切換路8を、弁体7を貫通する貫通孔8aと、貫通孔8aの一端から他端に至る弁体7の周壁の一側に沿って半円状に延設され、貫通孔8aと連通状態で各分岐管3,4,5に選択的に連通自在の外周溝8bとによって構成する。【選択図】図4
