派克BD系列阀具有相同的结构特点,它们由三部分组成:电气力矩马达、双喷嘴先导级和滑阀第二级。
力矩马达:力矩马达包括电气线圈、极靴和衔铁组件。衔铁装在一个倒置的挠性管上,挠性管也在力矩马达和阀的液压段之间起流体密封作用。
先导级:倒置的U型架固定在衔铁轴上并且置于两个喷嘴之间。衔铁运动通过轴传送到倒置架,改变喷嘴的开启,产生压差。架腔中的机械反馈弹簧消除来自高速回流在反馈机构周围的湍流状况。
第二级:这个区域控制输出流量。通过精确匹配阀芯和阀体上的过流锐边,使过流窗口口打开和关闭。打开供油压力至控制口C1或C2,流体将通过阀流出控制口返回。这个阀芯阀/阀体的过流面积是由牢固装在阀芯和先导级机械反馈弹簧上的反馈杆来控制的。
工作过程:当力矩马达没有电信号输入时,衔铁位于极靴气隙中间,平衡永久磁铁的磁性力,当有电流加在线圈上时,衔铁与控制信号成比例地偏转,产生一个顺时针或逆时针运动,方向取决于输入控制信号的极性。形成的力矩转动两喷嘴之间的U型架,引起压力的变化而移动阀芯的位置,导致线性的流量输出,反馈杆和机械弹簧组件提供一个与力矩马达力相反的力,使阀芯产生相对于电信号的可重复的比例运动。
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