Rexroth力士乐DBEM 10-7X/100XYG24K4M先导式溢流阀
DBEM 型阀门属于先导式溢流阀。此类阀用于限制液压系统的工作压力。根据电气控制值的不同，可使用这些阀门对要限制的系统压力进行无级设置。这些阀门的基本构成包括带有主阀心 (3) 的壳体 (1)、具有压力限制的叠加阀 (2) 以及比例先导控制阀 (11)。
型号 DBEM...
施加在通道 P 中的压力作用于主阀芯 (3)。同时，油口 P 处压力通过带喷嘴（4、5）的控制油路（6、7）施加于主阀芯 (3) 的弹簧负载侧。同时通过连接孔 (9) 将压力施加到比例先导控制阀 (11) 的阀架 (10)。先导座 (10) 处液压力可克服比例电磁铁 (12) 的控制值相关力。如果液压力超过线圈磁力，先导座 (10) 将会打开。此时先导油即可通过控制油路 (13) 流向油口 Y (14) 以及油箱；因此控制油路（6、7）上的主阀芯 (3) 处将会产生压降。释放从油口 P 到 T 的连接。主阀芯 (3) 可控制油口 P 处的设定工作压力。由于液压保护可防止出现不允许的高压值，因此已集成弹簧负载溢流阀 (2)。此压力限制为基于相关压力等级进行的预设值（请参阅表格第 6 页）。在阀门工作范围内，弹簧 (16) 可将阀架 (15) 固定于阀座 (17)，并且阀芯由此关闭。如果主阀芯 (3) 弹簧腔处压力超过阀门的允许调定压力，则阀架 (15) 将贴紧压缩弹簧 (16)，并且与弹簧室的连接将打开。先导油通过油口 Y (14) 流入油箱。由于存在控制油路（6、7），在主阀芯 (3) 处产生了压降。释放从油口 P 到 T 的连接。主阀芯 (3) 控制油口 P 处设定的工作压力。必要时还可通过调节元件 (19) 减小预设压力。油口 Y (14) 必须从外部管式连接至油箱。需在卸压后连接油箱。可通过油口 X (18) 对阀门进行卸载或限制压力。
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