燃料改用无铅汽油以后，阀座部分必须用特种材料制造的镶圈来补强，这种镶圈就是通常所谓的阀座圈。
In addition, the lead free gasoline is being used in the engine, so vavle seat insert (VSI) must be made by scpecial materials.
采取有弧度的圆形镶块，以对接接头的形式堵补部分管孔，将其移位到管道上的合适位置。
The round plates with arc shaped butt-welded joints were used for stopping sone tube holes which were moved away to another proper positions in the pipes.
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