由二套BIA机械密封背靠背安装，共用一个弹簧可组成一套双端面机械密封型式。

Two sets of back-to-back assembled mechanical seal BIA, and together with a Shared spring can form a double mechanical seal.

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它包括转轴、泵体、泵盖，两个叶轮背靠背地安装在一起，构成双吸叶轮；

The double attraction centrifugal pump consists of rotation shaft, pump body, pump cover, and double attraction vane wheel comprising two back-to-back installed vane wheels.

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NKE的通用设计(后缀ul)，主轴轴承具有轻预紧安装时成对或成套面对面或背靠背。

NKE spindle bearings of universal design (suffix UL) feature a light preload when mounted in pairs or sets either face to face or back to back.

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