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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Heat: the temperature range in the use of non-deformation.

耐热性：在使用温度范围内不变形。

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Heat: the temperature range in the use of non-deformation.

耐热性：在使用温度范围内不变形。

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