SWDH-04G-2B2-D24D SWDH-04G-2B3-D24D
利用溢流阀卸荷的回路先导式溢流阀的控制口连接一个二位二通阀，当二位二通阀如图中位置所示时，先导溢流阀控制口压力油流入油箱，压力近似为零，当系统压力升高大于弹簧压力时，此时溢流阀打开，将系统多余的压力泄掉，维持系统压力不变。此时卸荷回路相当于单级调压回路。这就是将系统中一部分油泄掉，而不是全部泄掉。
台湾锐力REXPOWER单向节流阀部分型号如下：
MTC-02-W-O MTC-02-A-O MTC-02-B-O
MTC-02-W-I MTC-02-A-I MTC-02-B-I
MTC-03-W-O MTC-03-A-O MTC-03-B-O
MTC-03-W-I MTC-03-A-I MTC-03-B-I
台湾锐力REXPOWER减压阀部分型号如下：
MGV-02-P-0 MGV-02-A-0 MGV-02-B-0
MGV-02-P-1 MGV-02-A-1 MGV-02-B-1
MGV-02-P-2 MGV-02-A-2 MGV-02-B-2
MGV-02-P-3 MGV-02-A-3 MGV-02-B-3
MGV-03-P-0 MGV-03-A-0 MGV-03-B-0
MGV-03-P-1 MGV-03-A-1 MGV-03-B-1
MGV-03-P-2 MGV-03-A-2 MGV-03-B-2
MGV-03-P-3 MGV-03-A-3 MGV-03-B-3
台湾锐力REXPOWER电液换向阀部分型号如下：
SWDH-04G-3C2-A22D SWDH-04G-3C3-A22D SWDH-04G-3C4-A22D
SWDH-04G-3C5-A22D SWDH-04G-3C6-A22D SWDH-04G-3C9-A22D
SWDH-04G-3C7-A22D SWDH-04G-3C8-A22D SWDH-04G-3C10-A22D
SWDH-04G-3C12-A22D SWDH-04G-2D2-A22D SWDH-04G-2D3-A22D
SWDH-04G-3C11-A22D SWDH-04G-3C40-A22D SWDH-04G-3C60-A22D
SWDH-04G-2D8-A22D SWDH-04G-2B10A-A22D
SWDH-04G-2B2-A22D SWDH-04G-2B3-A22D SWDH-04G-2B8-A22D
SWDH-04G-2B2B-A22D SWDH-04G-2B3B-A22D SWDH-04G-2B4B-A22D
SWDH-04G-2B2S-A22D SWDH-04G-2B3S-A22D SWDH-04G-2B2A-A22D
SWDH-04G-2B3A-A22D SWDH-04G-2B11B-A22D SWDH-04G-2B12B-A22D
SWDH-04G-2B9B-A22D SWDH-04G-2B60B-A22D SWDH-04G-2B9A-A22D
SWDH-04G-3C2-A11D SWDH-04G-3C3-A11D SWDH-04G-3C4-A11D
SWDH-04G-3C5-A11D SWDH-04G-3C6-A11D SWDH-04G-3C9-A11D
SWDH-04G-3C7-A11D SWDH-04G-3C8-A11D SWDH-04G-3C10-A11D
SWDH-04G-3C12-A11D SWDH-04G-2D2-A11D SWDH-04G-2D3-A11D
SWDH-04G-3C11-A11D SWDH-04G-3C40-A11D SWDH-04G-3C60-A11D
SWDH-04G-2D8-A11D SWDH-04G-2B10A-A11D
SWDH-04G-2B2-A11D SWDH-04G-2B3-A11D SWDH-04G-2B8-A11D
SWDH-04G-2B2B-A11D SWDH-04G-2B3B-A11D SWDH-04G-2B4B-A11D
SWDH-04G-2B2S-A11D SWDH-04G-2B3S-A11D SWDH-04G-2B2A-A11D
SWDH-04G-2B3A-A11D SWDH-04G-2B11B-A11D SWDH-04G-2B12B-A11D
SWDH-04G-2B9B-A11D SWDH-04G-2B60B-A11D SWDH-04G-2B9A-A11D
如果将活塞杆固定不动，那么液压泵输出的液压油全部通过溢流阀泄掉，这种情况下溢流阀使液压油发热。
高低压液压换向阀无法打开