Since not all of these can be removed, you may dress the seat with a "valve seat dresser" by grinding down the uneven surface.
因为并不是所有这些可以被删除，你可以打扮的“阀座修整磨削的座位下的不平衡”表面。
2
As the material of grinding wheel dresser, the dressing Performance of PCD is near to that of a single crystal diamond, but itS price is relatively lower.