PROBLEM TO BE SOLVED: To provide a three-way cock which supplies liquid chemical smoothly without generating stagnation of the liquid chemical within a second introduction pipe and a valve body.SOLUTION: The three-way cock includes a main channel 9 penetrating through the valve body 3 and a loop groove 10 formed on the side of the valve body 3 and extending in the circumferential direction from one end to the other end of the main flow channel. The loop groove 10 includes a first loop groove 11 extending from the one end of the main channel 9 to the middle of the loop groove 10 and a second loop groove 12 extending from the middle to the other end of the main channel 9. The first loop groove 11 becomes gradually narrower and deeper from the one end side of the main channel 9 toward the middle. The second loop groove 12 has a constant width and depth that are wider and shallower than the end of the first loop channel.COPYRIGHT: (C)2013,JPO&INPIT【課題】第2導入管や弁体内に薬液の滞留を生じさせることなく、スムーズな薬液の供給を行うことができる三方活栓を提供する。【解決手段】三方活栓は、弁体3を貫通する主流路9と、弁体3の側面に形成した、主流路の一端から円周方向周りで他端に至る周回溝10とを備える。周回溝10は、主流路9の一端から周回溝10の中間位置に至る第1周回溝11と、中間位置から主流路9の他端に至る第2周回溝12とで構成する。第1周回溝11は、主流路9の一端側から中間位置側にかけて徐々に幅が狭くかつ深くなる形状を有し、第2周回溝12は、第1周回溝の終端よりも幅が広くて浅い一定の幅及び深さを有する。【選択図】図4
