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The BPV-VP1 unloading valve is utilized in hydraulic systems where the pump is operating constantly,  Motor

The valve protects the pump from being overheated in the off-load mode by allowing a small flow through the pump (refer to the schematics). When a load sensing valve function is engaged, the bypass flow is cut off (as port ‘X’ is being pressurized). BPV-VP1 unloading valve.

The valve is also working as a ventilating valve. If there is some air in the pump housing after a long standstill of the hydraulic system. (The pump is assembled above the oiltank and during the standstill some oil in the pump housing has been drained back to the oil tank)