Rexroth力士乐DAW 10 A2-5X/200-17Y6EG24N9K4先导式压力截止阀
型号 DAW…FS…（可自由调节的切换压差）
DAW 型压力阀是一种先导式压力截止阀。例如，它用于蓄能器充液油路。此时，蓄能器中将充入液压油直至达到蓄能器充液压力为止。达到蓄能器压力后，阀门会将流量切换到卸压油路直至液压系统中的压降达到切换压差为止。然后，再次开始充液过程。
压力截止阀通常由主壳体 (1)、先导控制阀（2 和 3）、主阀心 (4) 和单向阀 (7) 组成。
将泵流量从 P 至 B 切换为 P 至 T。 ?
泵通过单向阀 (7) 向液压系统（P 至 A）供油。施加在通道 A 中的压力通过控制油路 (8) 作用于先导控制阀 (3) 中的控制阀芯。同时，通道 P 中的压力通过喷嘴 (5) 施加于主阀芯 (4) 的弹簧负载侧，并通过控制油路 (9) 作用在拧入式插装阀 (3) 的入口 (11) 处。当在拧入式插装阀 (3) 中通过调节主轴 (12) 设置的截止压力到达液压系统时，拧入式插装阀将打开从主阀芯 (4) 的弹簧负载侧到回油管路 (10) 再从内部进入 T（型号 DAW ...）的连接或通过油口 Y 从外部进入油箱（型号 DAW ...Y）的连接。
由于存在喷嘴 (5)，在主阀芯 (4) 处产生了压降。主阀芯将升离阀座，打开 P 至 T 的连接。单向阀 (7) 将关闭 P 至 A 的连接。执行机构压力 A 将使拧入式插装阀 (3) 保持在打开位置。
将泵流量从 P 至 T 切换为 P 至 A。 ?
如果执行机构压力 A 下降至在调节主轴 (14) 处设定的压力值，则拧入式插装阀 (3) 将切换到初始位置，并关闭从主阀芯 (4) 的弹簧负载侧到回油管路 (10) 的连接。这样，主阀芯 (4) 弹簧负载侧的压力将会增加，而从 P 到 T 的连接将被压缩弹簧 (6) 关闭。泵再次通过单向阀 (7) 向液压系统，即从 P 到 A 供油。
型号“FSB07”
此阀的喷嘴位于控制油路 (11) 中，以用于潜在的换向冲击衰减。这样，油路压力（P 至 T）将增加。请参阅特性曲线。
注意！
仅限间接压力限制功能：?
泵压力（至油箱）的压力限制功能不是直接提供的，而是仅通过到通道 T 的单向阀 (7)、控制油路 (8) 和先导控制阀 (2) 间接提供。
设置切换压差?
出厂时，阀门被设置为切换压差约为公称压力的 10 % 至 12 %。可以设置为公称压力的 50 %。
交付时，调节主轴 (12) 将被拧出并设置为最小可调节切换压力。
通过拧入调节主轴 (12)，可增大顶部切换压力。
通过调节主轴 (14) 可调节切换压差：拧出减小，拧入增加。
通过锁紧螺钉 (13) 和锁紧螺母 (15) 确保压力调节。
不同的系统条件（尤其泵流量和执行机构流量很高时）可能导致比特性曲线中所示更高的切换压力。在这里，通过此阀可以选择性地调节系统切换压差。
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