It wholly changes the defects of hard-sealed metal ball valves such as easy to be leaked, big torsional moment and non-corrosive seal surface.
彻底改变了金属硬密封球阀艺泄露、扭矩、密封面不耐腐蚀的缺点。
It wholly changes the defects of hard-sealed metal ball valves such as easy to be leaked, big torsional moment and non-corrosive seal surface.
彻底改变了金属硬密封球阀艺泄露、扭矩、密封面不耐腐蚀的缺点。
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