单端面机械密封：结构简单，密封性能好，使用寿命长，维护方便（符合ISO3069 标准）。
Single mechanical seal : simple in structure, good sealing performance, long life, easy to maintain (meet the criterion of ISO3069).
采用串联式波纹管机械密封代替原单端面机械密封，解决了减底泵机械密封冲洗液对介质的影响问题。
The infection of the washing liquid used in the pump at the decompression tower bottom to the medium was introduced.
XM31A型机械密封为单端面、多弹簧非平衡型结构。采用传动螺钉传动。
Mechanical seal type XM31A has a single seal face and multi-spring unbalanced structure, and is driven by screw transmission.
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