Oleodinamica Marchesini V0444 VBAU 3/8 cross-line relief valve with pilot check

Oleodinamica Marchesini V0444 (VBAU 3/8) is a cross-line relief valve with pilot check with a factory maximum pressure of 350 bar and listed mass of 2.534 kg. The original sheet identifies this exact article; the manufacturer photograph represents the series.

The factory maximum flow is 35 l/min and the connection size is G 3/8. Actual relief setting and spring range are distinct from the maximum pressure rating. The observed supplier offer specifies a 10–180 bar range for the in-line valves; no unobserved adjustment or pressure-setting suffix is generated.

VBAU combines a double pilot-operated check with a dual cross-line relief circuit. It holds the actuator in position and limits pressure entering it. Connect V1/V2 to supply and C1/C2 to the actuator. The drawing gives different overall lengths for different relief springs; no single overall length is assigned without that execution being established.

The zinc-plated steel body uses hardened and ground internal parts and standard BUNA-N seals. Follow the original circuit and installation drawing in the local PDF. Where pressure/flow curves use oil at 50 °C and 30 cSt, these are curve reference conditions and not an operating-temperature specification. The complete relevant factory spread is retained unchanged.