| 摘要 |
PROBLEM TO BE SOLVED: To provide an air valve device capable of preventing damage of an air valve, even if the device is subjected to strong vibration such as an earthquake disaster.SOLUTION: In an air valve device, an openable/closable air hole 17 is formed at the upper part of a valve box 8, a communication hole 16 in communication with a pipe conduit is formed at the lower part of the valve box 8, an in-valve box passage 18 in communication with the air hole 17 and the communication hole 16, and an ascendable/descendable float 9 are arranged in the valve box 8, and the air hole 17 is closed by a lift of the float 9. Also in the air valve device, there is arranged a pressure-release means 30 for releasing pressure in the valve box 8 to the outside when the pressure in the valve box 8 is raised to regulated pressure or higher. |
