当①口没有压力或压力较低，阀芯处于原始位置，②口和③口相通，④口关闭;当①口压力超过设定压力，阀芯开始移动，③口和④口相通，②口关闭。该阀结构为外控外排，一般用于执行元件的换向。

When the pressure at port 1 is removed or lower, The spool is in its original position, port 2 is connected to port3 and closing the port4; When the pressure at port 1exceeds the set pressure , the spool begins to move, port 3 is connected to port 4 and closing the port 2; The valve

structure is externally controlled and discharged , Generally used for reversing the actuator components.

1.最高压力(Pressure Max):350bar

2.最大流量(Flow Max):120L/min

3.切换压力(Pilot pressure):1.0+0.1bar

4.泄漏量(Internal leakage)≤80ml/min at 200 bar                             

5.油液清洁度(Cleaning code):20/18/15(NAS9)

6.工作温度(Temperature range):-20~+100℃

7.安装扭矩(Installation torque):60~65Nm