用打气筒向篮球、排球、足球等球类内部充气时，所用的一种工具。一端粗大，可接在打气筒上；另一端细如针，可接入球中。
... ball magnetic reversible level meter 球式磁翻转液位计 ball needle 球针 ball net 球网 ...
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此图描绘的是针周围的热如何扩展到周围，形成一个热球？
Drawing depicts how the heat expands into the surrounding needles to form a thermal sphere.
首选应用是轴承结构，包括滚珠和轴套。还有，它也能用来做刀具、针形阀、球型止回阀、阀门基座、泵零件、球头螺栓、轴套、抗磨损纺织机械。
In addition, it should be considered for cutlery, needle valves, ball check valves, valve seats, pump parts, ball studs, bushings, and wear-resistant textile components.
其针阀由浮球臂带动，在液恢上升时开大。
Driven by the float arm of the needle in the liquid recovery opening up big time.
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