Punch a hole in the middle of the paper cover where the hole of the spool is. Now your hole should run through the paper, spool, and cardboard without any obstructions.
在纸片棉线轴洞的位置打个洞，这个洞贯穿了纸片、棉线轴和硬纸板，洞内没有其他遮挡物。
According to the poor linearity of pressure characteristic in a type of electric water valve, the optimization and calculation process of the spool structure was given in this paper.
针对某型号电动水阀压力特性线性度差的问题，对阀芯结构进行优化设计，给出了阀芯的设计和计算过程。
The paper USES spool valve system drawing equivalent to cartridge valve system drawing to design a typical hydraulic closed-circuit system consisting of two-way cartridge valve.
本文采用滑阀系统图等效成插装阀系统图的方法，设计出一种由二通插装阀组成的典型闭式系统。
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