机械密封：密封面、密封垫及轴封等元件必须完好，否则将导致过度泄漏，对有磨损或损伤的元件必须更换。

Mechanical seal: seal face, gasket and shaft seal, etc parts must be undamaged, otherwise will result in over leakage, sure to change parts with wear and tear or damage.

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组件所有外露接口均设有防护堵、盖，且封闭良好，接口螺纹和法兰密封面无损伤；

All accessory interfaces should have protection covers with good sealing, there is no damage on the connecting screws and flange sealing surface.

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