This valve enables to keep the flow to P constant to a required setting, independent of pressure or inlet flow. Excess flow is drained in B and it is available for a second function. Port B is insensitive to pressure changes but not to flow changes.

VPR3能够使P口的油液持续稳定的按设定流量供油，且不受背压影响。多余的流量从B口流出或者供给第二个系统。