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。该类型的阀一般具有较高的启闭率,内泄漏小，适用于高压力、大流量的液压系统。

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 generally has high opening and closing rate ,very low internal leakage, Suitable for the hydraulic system of high pressure and large flow.

1.额定压力(Rated pressure):200bar

2.额定流量(Rated flow):60L/min

3.开启率(Cracking Rate)≥90%

4.闭合率(Closing Rate)≥85%

5.补油开启压力(Oil make-up Cracking Pressure):0.4 bar                       

6.内泄漏 (Internal Leakage)≤50ml/min at 150bar

7.油液清洁度(Cleaning code):20/18/15(NAS9)

8.工作温度(Temperature range):-20~+100℃

9.每装压力变化(Pressure change per turn):250bar

10.安装扭矩(Installation Torque):45~50Nm

11.锁紧扭矩(Nut Tightening Torque):30~35Nm