... 长气门芯 long core 外弹簧气门芯 outer spring core 大芯腔气门芯 core for large core chamber ...
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outer spring core
外弹簧芯
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The water heating control valve is composed of a valve casing, a valve outer cover, an inner cover, a pressure spring, a valve core, a positioning device and a sealing ring.
水暖控制阀由阀壳、阀外盖、内盖、压簧、阀芯、定位装置及密封圈构成。
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