阀座面为钨铬钴合金，经过研磨抛光达到镜面光洁度。
镜面光洁度最少是表面粗糙度0.8以下。，用电镀或者抛光。
Mirror finish should be less than 0.8 of surface roughness at least. It is processed via plating or polishing.
事实上，相反的似乎是怎样，那镜面光洁度实际上会降低网路的效能。
Indeed, the reverse seems to be the case, that a mirror finish actually degrades performance.
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