oil pump relief valve

[bsfc9]

please explain the functioning of the relief valve in a typical wet sump V8 oil pump(BBC). Does increasing spring pressure only affect the max pressure at which the pump goes into relief or does it change the entire pressure "curve"?

 

[patprimmer]

It raises the pressure when the valve begins to open.

Regards

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[geeaea]

The automotive oil pump is positive displacement. If the volume at a given viscosity generates a resultant pressure in excess of the pressure relief setting, flow is shunted to either the suction side of the pump ..or back to the sump.