| 摘要 |
PROBLEM TO BE SOLVED: To provide an air valve suitable for shallow-layer burial by shortening the axial size without reducing the buoyancy effect of a float valve element. SOLUTION: This air valve is provided with a valve box 1 connected in the pipeline of a feed liquid pipe and forming a liquid accepting chamber 2 accepting the fed liquid in the pipeline, a float valve element 7 supporting movably in the axial direction by a float valve element guide member 6 provided in the valve box, floated by buoyancy when water is filled in the valve box, and dropped when no water is filled in the valve box, and an idle valve element 9 having a small air hole 8a and floated together with the float valve element to close a large air hole 3 provided on a cover member 4 when water is filled in the valve box. When no water is filled in the valve box and the float valve element is dropped, the small air hole of the idle valve element is opened to discharge the retained water in the valve box. The float valve element is provided with a projection 17 on the lower end side in the axial direction, and the projection is movably coupled with an axial guide hole 5 provided on the float valve element guide member in this air valve.
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