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.

• 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。