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本文叙述了天然气发动机进排气门研制工艺。通过全相分析、堆焊和热处理等工艺的改进，成功地实现了进口机进排气门的国产化。
This article describes the natural gas engine intake and exhaust valve development process. Through the all-phase analysis, welding and heat treatment and other improvements, the successful realization of the imported machine into the exhaust valve localization.