| 摘要 |
An inflatable bladder (10) is provided with an inflation valve device (2) that includes a sleeve member (21), a tubular indicator (22) mounted movably in the sleeve member and marked with indicia, an inflation needle (24) mounted in the indicator, and an urging member (29) disposed between the sleeve member and the indicator in such a manner that outward movement of the indicator resulting from the pressure difference between the pressure in the bladder and the atmospheric pressure results in displacements of the urging member.
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