后纺是抛光，以消除任何锋利的边缘，可能损害阀门。
After spinning it is polished to remove any sharp edges that could damage the valves.
决定阀门操作的力主要有三种：推力，扭矩和边缘拉力。
The three major forces involved in valve actuation are thrust, torque and rimpull.
许多实际应用要求闸阀、截止阀和截止止回阀采用齿轮装置来降低手轮的边缘拉力，使得靠一个人的力量就可以启闭阀门。
Many applications require gate, globe and stop-check valves to use gearing to reduce the hand wheel rimpull and thus allow one man to manually seat or unseat the valve.
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