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派克PARKER电液方向控制阀D*1VW系列部分型号
派克PARKER电液方向控制阀D*1VW系列技术简介
D31, D41, D81, D91及D111系列是电液操控的4/3 （三位四通)或4/2(二位四通)方向控制阀，并由一NG6电磁阀进行先导操控。
先导控制油的压力和流量对主级阀芯的换向响应时间有重要的影响。为确保证主阀芯换向可靠，应选择恰当的控制油源和泄油选项。(若阀芯机能有尸通丁的情况，则应需采用外部控制油源或在主阀口内置一个单向阀。对于换向过渡位置机能为负遮盖的阀，建议亦按相同方法处理。)在任何工作状况下均必须保证z低的控制压力。
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