I used a long bolt as a shaft, and the end of the spool is held on with a nut.
我用很长的螺栓作为骨干，并在年底举行的阀芯是一个螺母。
While the linear motion is actuated by pressure difference of two end spool chamber.
阀芯的轴向运动则由两端阀腔的静压力推动。
So that the end of the spool comes off and the coil can be removed.
这样的结束阀芯脱落后的线圈可以被删除。
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