| 摘要 |
To perform exhaustion to regulate pressure in a case with surely recovering liquid in the case without draining it even when the pressure in the case rises rapidly, a breather for regulating internal pressure in a case by performing exhaustion to the outside when the internal pressure exceeds predetermined pressure thereby reducing the internal pressure, includes an exhaust passage leading from the inside of the case to the outside; a liquid recovery passage for recovering liquid discharged from the inside of the case to the inside of the case; and a discharge valve means which opens when the internal pressure in the case exceeds the predetermined pressure, wherein the liquid recovery passage is provided at the atmosphere side beyond the discharge valve means, and a recovery valve means is provided in the liquid recovery passage.
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