Three O-ring seals on the stem to ensure sealing performance more effectively.

阀杆密封采用三道“O”型圈，使密封性能得到更有效地保障。

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Three O-ring seals on the stem to ensure sealing performance more effectively.

阀杆密封采用三道“O”型圈，使密封性能得到更有效地保障。

youdao