Improvement for the mechanicalsealcover and nationalized modification for the mechanicalseal are made, and good results and benefit have been achieved.
分析了引进苯酐泵的运行情况，进行了机封压盖改进和机封国产化设计，取得了良好的效果和效益。
2
A mechanicalseal and water seal combined floor drain consists of a floor drain cover, a main floor drain body, a float and a hose type magnetic seal valve.