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级先导阀的组成先导阀基本是由线圈、衔铁、悬挂件、分流板和活动瓣片组成，有些先导阀带有内置的溢流阀和过滤器，以限制控制压力和防止瓣片中的节流孔被污染堵塞。由磁铁、线圈和衔铁组成的组件通常称为力矩马达R900935623 4WRA10WA60-22/G24N9K4/V
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