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closed center directional stem是什么意思
中文翻译中位关闭方向阀芯
网络释义
1)closed center directional stem,中位关闭方向阀芯2)closed center valve,中间位置封闭的阀(方向阀);闭中心阀3)closed center valve,中位关闭阀[O型中位阀]4)closed center pilot valve,中位关闭先导阀5)closed center solenoid valve,中位关闭电磁阀6)closed center pilot control valve,中位关闭先导控制阀
