The third is a vertical sliding gate.

第三道，就是从上面放下来的闸门。

Mg-Al spinel ladle brick in Xining Special Steel for long-term use, such as steel, sliding gate series in the Benxi steel mill and other good results.

镁铝尖晶石钢包砖在西宁特钢等钢厂长期使用，滑动水口系列在本钢等一些钢厂使用效果很好。