Rexroth力士乐先导式压力顺序阀的特点：适于用作预压阀，顺序阀或旁通阀；用于底板安装；油口安裝面符合 ISO 5781；用作插装阀；4 个压力等级；4 种调整类型： 旋钮、六角衬套和保护帽、带刻度可锁定旋钮、带刻度旋钮；单向阀，可选。
力士乐DZ型压力顺序阀是一种先导式压力顺序阀。它用于与压力相关的次级回路切换。 压力顺序阀的基本构成是带主阀心（7）的主阀（1）和带调整类型以及可选单向阀（3）的先导控制阀（2）。 根据先导供油和先导回油，这类阀从功能上区分为：
预压阀类型 DZ. . -.-5X/…（控制油路 4.1，12 和 13 打开；控 制油路 4.2，14 和 15 关闭） 施加于通道 A 的压力通过控制油路（4.1）作用于先导控制 阀 （2）中的先导阀芯（5）。通过节流孔（6），通道 A 中的 压力同时作用于主阀芯（7）的弹簧负载侧。如果压力超过在弹 簧（8）处设置的值，则先导阀芯（5）将顶着弹簧（8）移动。 此时主阀芯（7）的弹簧负载侧的液压油通过节流孔（9），控 制边（10）以及控制油路（11）和（12）流入通道 B。这将 在主阀芯（7）处产生压降。主阀芯（7）向上移动并打开从通 道 A 到通道 B 的连接。将通过在弹簧（8）处设置的值使通道 A 中的压力超过通道 B 中的压力。在先导阀芯（5）处发生的泄漏 将通过先导控制阀的弹簧腔（17）和控制油路（13）导入到通 道 B 中。如果次级油路（通道 B）中的压力比通道 A 中的压力 高，则可以安装可选的单向阀（3）用于自由回流。
预压阀类型 DZ. . -.-5X/.X…（控制油路 4.2，12 和 13 打开； 控制油路 4.1，14 和 15 关闭） 大体上，此阀的功能与类型 DZ. . -.-5X/… 阀的功能相对应。 但是，对于型号 "X"，将在外部通过控制油路 X（4.2）来提供 开启信号。
顺序阀类型 DZ. . -.-5X/.Y…（控制油路 4.1，12 和 14 或 15 打开；控制油路 4.2 和 13 关闭） 大体上，此阀的功能与类型 DZ. . -.-5X/… 阀的功能相对应。 但是，对于型号 "Y"，在先导阀芯（5）处发生的泄漏必须通 过油路（14）或（15）以零压力导入到油箱。先导油通过油 路 （11）和（12）导入到通道 B 中。
旁通阀类型 DZ. . -.-5X/.XY…（控制油路 4.2，14 或 15 打 开；控制油路 4.1，12 和 13 关闭） 大体上，此阀的功能与类型 DZ. . -.-5X/… 阀的功能相对应。 但是，对于型号 "XY"，将在外部通过控制油路 X（4.2）来提 供开启信号。有孔先导阀芯（16）处的先导油和发生的泄漏将 通过油路（14）或（15）以零压力导入油箱。
力士乐DZ型先导式压力顺序阀的常用订货号：
R900901725 DZ 10-1-5X/50
R900962884 DZ 10-1-5X/50V
R901031959 DZ 10-1-5X/50M
R901146330 DZ 10-1-5X/50X
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R900520436 DZ 10-1-5X/50YM
R901137535 DZ 10-1-5X/50XYM
R900566811 DZ 10-1-5X/100
R900785539 DZ 10-1-5X/100V
R901145334 DZ 10-1-5X/100M
R901070218 DZ 10-1-5X/100X
R900533539 DZ 10-1-5X/100XM
R900535769 DZ 10-1-5X/100Y
R900501167 DZ 10-1-5X/100YM
R900733190 DZ 10-1-5X/100YMV
R900938567 DZ 10-1-5X/100XY
R900930856 DZ 10-1-5X/100XYV
R900520359 DZ 10-1-5X/100XYM
R900597547 DZ 10-1-5X/200
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R900503450 DZ 10-2-5X/50
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R900502897 DZ 10-2-5X/100
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R900596755 DZ 10-2-5X/200
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R900597934 DZ 10-2-5X/315
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R900737793 DZ 10-3-5X/50
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R901023105 DZ 10-7-5X/315
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R900523682 DZ 20-2-5X/50
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R901021238 DZ 30-1-5X/50
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R900500687 DZ 30-1-5X/200
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R900512920 DZ 30-1-5X/200XYM
R900597731 DZ 30-1-5X/315
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