• 1. operating valve spring: 操作阀簧 | 作用阀弹簧
• 2. Operating g valve spring: 作用阀弹簧

• 1.This means that the operating mechanism must be able to move sufficiently far enough away from the valve to allow the valves to be fully closed against its seat by the valve spring.
  这意味着操作机构必须离阀门足够远以允许阀门通过气门弹簧使其完全关闭。
  dict.yoduao.com

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