| 摘要 |
PROBLEM TO BE SOLVED: To provide a valve device of a simple structure in which operation of a valve is not disturbed by a solid matter, in the air valve device used in a pipe conduit and the like for agricultural water in which the solid matters may be mixed.SOLUTION: In a double float-type air valve including an upper float body 32 for opening and closing a main valve port 312, and a lower float body 4 for opening and closing a small valve port formed on the upper float body 32, an upper body is vertically movably mounted on a suspended vertical rod 313 vertically disposed from an upper cover (disc projecting portion 311) of a float chamber having the main valve port, a guide body provided with a guide cylindrical portion 331 at its center, is mounted on the suspended vertical rod, and the lower float body 4 including a large-diameter lower portion 41 and a pillar upper portion 42 inserted to the guide cylindrical portion, is assembled in a mounted state on an upper position of an outflow port connected to a pipe conduit, of a bottom plate (disc projecting portion) of the float chamber.SELECTED DRAWING: Figure 1 |
