当P口压力达到设定压力后，先导阀芯首先被打开，由此产生的压差使得主阀芯打开，P到T实现溢流。该类型的阀从T到P始终关闭，反向可以承受较高的背压，适用于回油背压较大的液压系统。

When the pressure at "P"reaches the valve setting,the pilot spool starts to open , Next the main spool opening because of the pressure drop between inside and outside of main spool, Realize overflow from P to T.This type of valve always locked from T to P, Reverse can withstand high back pressure Suitable for the hydraulic system of high back pressure from T to P.

1.额定压力(Rated pressure):250bar

2.额定流量(Rated flow):50L/min

3.开启率(Cracking Rate):≥94%

4.闭合率(Closing Rate):≥86%

5.油液清洁度(Cleaning code):20/18/15(NAS9)

6.工作温度(Temperature range):-20~+100℃

7.每转压力变化(Pressure change per turn):82.5bar                           

8.安装扭矩(Installation Torque):40~47Nm

9.锁紧扭矩(Nut Tightening Torque):12~17Nm