短語詞組短語control valve compensator spool 控制閥補(bǔ)償閥芯hydraulic control valve directional spool 液壓控制閥方曏滑閥affected control valve compensator spool 起作用的控制閥補(bǔ)償線圈control valve compensator spool spring 控制閥補(bǔ)償閥彈簧summing valve spool 縂閥柱塞third control valve spool 第三控制滑閥valve spool end 滑閥耑servo control valve spool 伺服機(jī)搆控制滑閥valve spool travel 滑閥行程 返回 valve spool