Rexroth力士乐DA 10-1-5X/50-10压力截止阀
型号 DA…FS…（可自由调节的切换压差）
DA 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 DA ...）的连接或通过油口 Y 从外部进入油箱（型号 DA ...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。
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