The dense white nodules of calcification are present on either valve surface.
在瓣膜的表面可见密集的白色钙化灶。
To ensure tight closure, and the valve seat valve sealing surface of the ground.
为了保证关闭严密，阀瓣与阀座密封面进行的研磨。
The current nuclear valve sealing surface surfacing material is generally cobalt alloy.
目前核阀密封面堆焊材料一般均为含钴合金。
The current nuclear valve sealing surface surfacing material is generally cobalt alloy.
目前核阀密封面堆焊材料一般均为含钴合金。
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