Dual Pressure (SPRV)
Composed of relief valve and solenoid valve.
Solenoid valve is mounted on top of relief valve, and connected with vent port of relief valve.
The power signal of solenoid can control the system pressure, if connect with vent port of relief valve, it will offer dual-level / triple-level pressure control.
2P means to habe dual-level pressure.
3P means to habe triple-level pressure.