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1·We currently offer five main product lines of valve guide, rocker arm, precombustion chamber, valve seat insert and rocker shaft.

我公司现有产品包括气门导管、气门摇臂和预燃烧室、气门座、摇臂轴总成各大系列品种。

2·This paper reports the development and the application detail of cobalt-free, lead-free and environmentally friendly exhaust valve seat insert.

这篇论文详细报道了无钴、无铅及有利于环境的排气阀座圈的开发与使用。