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对于执行元件和控制元件，演示文稿都是基于相应回路图符号，这也为介绍回路图符号作了准备。 根据系统工作原理，您可对所有回路依次进行编号。如果**个执行元件编号为0，则与其相关的控制元件标识符则为1。如果与执行元件伸出相对应的元件标识符为偶数，则与执行元件回缩相对应的元件标识符则为奇数。 不仅应对液压回路进行编号，也应对实际设备进行编号，以便发现系统故障。 DIN ISO1219-2标准定义了元件的编号组成，其包括下面四个部分：设备编号、回路编号、元件标识符和元件编号。如果整个系统仅有一种设备，则可省略设备编号。 实际中，另一种编号方式就是对液压系统中所有元件进行连续编号，此时，元件编号应该与元件列表中编号相一致。 这种方法特别适用于复杂液压控制系统，每个控制回路都与其系统编号相对应
液压系统的保养
一个液压系统的好坏不仅取决于系统设计的合理性和系统元件性能的的优劣，还因系统的污染防护和处理，系统的污染直接影响液压系统工作的可靠性和元件的使用寿命，据统计，国内外的的液压系统故障大约有70%是由于污染引起的。 油液污染对系统的危害主要如下：
1）元件的污染磨损
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WTB4SL-3N1161
WTB4SL-3N1161
WTB4SL-3P3261
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WL4SL-3F2234
WL4SL-3F2234
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WTB4SLC-3P2262A71
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WTB4SL-3N2261
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油液中各种污染物引起元件各种形式的磨损，固体颗粒进入运动副间隙中，对零件表面产生切削磨损或是疲劳磨损。高速液流中的固体颗粒对元件的表面冲击引起冲蚀磨损。油液中的水和油液氧化变质的生成物对元件产生腐蚀作用。此外，系统的油液中的空气引起气蚀，导致元件表面剥蚀和破坏。
2）元件堵塞与卡紧故障
固体颗粒堵塞液压阀的间隙和孔口，引起阀芯阻塞和卡紧，影响工作性能，甚至导致严重的事故。
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