Oleodinamica Marchesini V0512 VABP 3/8 two-pump hi-low unloading valve

Oleodinamica Marchesini V0512 (VABP 3/8) is a two-pump hi-low unloading valve. The factory pressure rating is 350 bar. The separate factory flow limits are 20 l/min at AP, 40 l/min at BP and 60 l/min at T. The low-pressure-stage limit is 100 bar, separate from the 350 bar maximum pressure rating.

Connect BP to the higher-flow pump, AP to the lower-flow pump, U to the working circuit and T to tank. Port M accepts a pressure gauge when required. At the BP threshold, the valve diverts the higher-flow pump to tank while the smaller pump continues the high-pressure stage. The catalogue standard spring ranges are 20–80 bar for BP and 50–350 bar for AP; verify the actual settings and pump flow limits during selection.

Thread sizes differ by port: AP 1/4 inch BSP, BP 3/8 inch BSP, U 3/8 inch BSP, T 1/2 inch BSP. Use the original drawing for port positions and the gauge connection.

The manufacturer specifies a zinc-plated steel body, hardened and ground steel internal parts and BUNA N seals. The local technical reference preserves the complete relevant factory spread with the model table, circuit, dimensions and performance curves. Representative manufacturer product image for the VABP series. Use the exact article table and original drawing in the local PDF for port layout, dimensions and adjustment execution.