Patent ID: 7472717

Claim:
A float valve comprising: a case having a space formed inside; a connection hole that is formed on a side surface or on a bottom surface of the case to connect inside and outside of the case; a first valve port that is formed on an upper surface of the case; a second valve port that is formed on the surface of the case to have a larger diameter than that of the first valve port; a float to be housed in the case to freely move therein; a first valve body portion that is formed on an upper surface of the float to close the first valve port; a sub float having an opening portion through which the first valve body portion goes, and is covered over the upper surface of the float in a state where the first valve body portion passes through the opening portion; and a second valve body portion that is formed on an upper surface of the sub float to close the second valve port, the second valve body portion being provided with an axis portion extending through the second valve port and protruding upwardly; a retainer portion engaging with the axis portion mounted on the upper surface side of the case, and a spring disposed on the retainer portion to bias the sub float upwardly in such a manner that a load from the sub float is not added to the float.