Patent ID: 8100153

Claim:
A float valve apparatus comprising: a housing including: a partition wall that divides an internal space of the housing into a lower space and an upper space and that has an opening formed therein; a ventilation pipe that is formed to communicate the upper space with an outside; a valve seat that is formed at the opening of the partition wall; and a communication hole that is formed to communicate the lower space with the outside; a float valve that is disposed to be slidably movable in a vertical direction in the lower space and that is configured to be upwardly floated by liquid flowing into the lower space through the communication hole so as to open and close the opening; an upward urging spring that is disposed between a lower surface of the float valve and a bottom surface of the housing to urge the float valve toward the opening; and, a support spring that is disposed inside the upward urging spring to support the float valve such that a bottom portion of the float valve is prevented from contacting the housing in a state where the float valve is moved to a lower-most position.