Problem to be solved: to provide a three-way valve capable of high-speed moving of a plunger and capable of switching the channel at high speed and surely.The cylindrical portion 17 is disposed along a line connecting the first opening a and the second opening b in the housing 11, the first end is positioned in the vicinity of the first opening and the third opening C, and the second end is communicated with the second opening. A first groove 23 is provided between the first end and the second opening.The plunger is movably provided in the cylindrical portion, has a third end and a fourth end, and when the third end closes the first opening, the fourth end moves away from the second opening to expose a portion of the first groove 23 and the fourth end disengages from the first opening when the fourth end closes the second opening The first groove 23 is closed.Diagram
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