PROBLEM TO BE SOLVED: To reduce an increase rate of a valve opening lift of a valve element to a unit rotating angle of a lever when a float moves up due to inflow of drainage.SOLUTION: A casing having a valve chest 6 inside, is constituted by fastening a cover body 4 to a body 3 having an inlet 1 and an outlet 2. A first valve port 7 and a second valve port 8 for communicating the valve chest 6 and the outlet 2, are formed at a lower portion of the valve chest 6. A lever 11 is disposed in a state of being rotated on an oscillation shaft 10 supported in the valve chest 6. A float 12 moving up and down according to a liquid level in the valve chest 6 is connected to one end portion side of the lever 11. A connection shaft 13 in parallel with the oscillation shaft 10 is supported at the other end side of the lever 11. A valve element 15 is disposed in a state that it is connected to the lever 11 through the connection shaft 13 to open and close the first valve portion 7 and the second valve portion 8. When the valve element 15 closes the first valve port 7 and the second valve port 8, the connection shaft 13 is positioned at a lowest point of a circle of which the center is the oscillation shaft 10, and the circle of which a radius is a distance between the oscillation shaft 10 and the connection shaft 13.
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