This article introduces the engine important parts cylinder head valve pipe hole and sealing trip on their technical method and analyse used in the machining center.

介绍了发动机上重要部件汽缸盖中气门导管孔和密封带在加工中心上的工艺方法，并对其进行了分析。

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Put the center of the sealing seat and the hole in the wall in a line and according to Figure 3 select method a orb to support the rear of soot-blower.

将吹灰器平置，密封支座中心对准炉墙开孔，根据图三的吊装示意图，选择方法a或方法b支承吹灰器尾部。

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