In a larger range of pressure and temperature can be completely sealed.
在较大的压力和温度范围内，能实现完全密封。
Limited by the ring material, the use of butterfly valve pressure and low temperature range.
受密封圈材料的限制，蝶阀的使用压力和工作温度范围较小。
Limited by the ring material, the use of butterfly valve pressure and low temperature range.
受密封圈材料的限制，蝶阀的使用压力和工作温度范围较小。
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