valve outer chamber cover 阀外室盖
main valve chamber upper cover [铁路] 主阀室上盖
main valve chamber bottom cover [铁路] 主阀室下盖
The valve chamber cover is missing.
阀室盖不见了。
The noise of 4110Q diesel engine and its oil pan, flywheel cover, oil pump, valve chamber has been studied by the analysis system of B&K3560 in the normal Semi-anechoic chamber.
在标准半消声室，用B&K3560噪声测量分析系统对4110Q柴油机整机和油底壳、飞轮壳、喷油泵、摇臂罩等零部件的噪声进行了台架试验研究。
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