如果气门关闭不严，发动机就不能发挥出全部的功率。

If the valves do not close fully the engine will not develop full power.

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所以阀门能完全关闭，气门间隙在操作机构内是必须的。

So that the valves can close fully some clearance is needed in the operating mechanism.

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气门杆上的弹簧使气门保持在气门座上(关闭状态)。

A spring on the valve stem tends to hold the valve on its seat (closed).

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气门杆上的弹簧使气门保持在气门座上(关闭状态)。

A spring on the valve stem tends to hold the valve on its seat (closed).

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