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):50bar

2.额定流量(Rated flow):20L/min

3.开启率(Cracking Rate)≥90%

4.闭合率(Closing Rate)≥80%

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):46.4bar                           

8.安装扭矩(Installation Torque):38~43Nm

9.锁紧扭矩(Nut Tightening Torque):23~28Nm