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Control Method： 2-way, 4-port, on-off/commutation control
Power off : Allow oil to flow bidirectionally from port 3 to port 4, with port 2 being blocked.
Power on：Port 3 will connect to port 2, the pressure at port 3 is proportional to the coil current.
If the pressure at port 3 exceeds the set value of the coil, will overflow at the fuel port 4.
The back pressure of the oil port 4 is added to the pressure setpoint of the valve in a ratio of 1:1.
Application：Proportional pressure reduction control devices
