Pump body seal part of the series for two sets of mechanical seals, mechanical seal, code-named the upper part 60b, the lower mechanical seal, code-named 60a.
泵体部分的轴封为两套串联的机械密封，上部机械密封代号为60b，下部机械密封代号为60a。
Pump body seal part of the series for two sets of mechanical seals, mechanical seal, code-named the upper part 60b, the lower mechanical seal, code-named 60a.
泵体部分的轴封为两套串联的机械密封，上部机械密封代号为60b，下部机械密封代号为60a。
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