该组合式机械三通密封的特殊设计使之能配合开孔机开出与管道内径相等的孔；

The special design of the tee branch is appropriate for drilling holes equal to the inner pipeline . diameters.

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在过盈配合中由于配合表面过盈量的影响，常使装配后的套筒类零件发生轴类零件内径减小和孔套类零件外径增大。

In the interference fit of assembled parts, inner diameter of sleeve-type parts was reduced and outer diameter of whole cover parts was increased by the magnitude of interference effects.

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