Oleodinamica Marchesini V0490/180 VAU 1/2 DE OMS motor-mounted cross-line relief valve

Oleodinamica Marchesini V0490/180 is the VAU 1/2 DE OMS motor-mounted cross-line relief valve with the actual selected 10–180 bar spring range and standard screw adjustment. Its manufacturer base row specifies maximum flow 50 l/min, maximum operating pressure 350 bar and 1/2" BSP connections. The full supplier-selected code is recorded directly, rather than generated from the ordering options.

The assembly limits pressure in both hydraulic-motor branches by crossed discharge. It is intended for Danfoss OMS motors. Connect M1 and M2 to the motor and V1 and V2 to supply according to the original interface drawing. Compatibility with a named motor series does not mean every shaft, port or mounting variant has been independently checked.

The base execution is the double-acting relief arrangement. Brake-release /SF and anti-cavitation /AC variants are separate articles and are not inferred for this selected code.

The body is zinc-plated steel with hardened and ground internals, standard BUNA-N seals and guided-poppet sealing with negligible leakage. The common base row gives mass reference 1.326 kg; this is not an independently weighed calibrated or handknob execution. No delivered preset is assumed from the catalogue spring table.

The local technical PDF retains the complete relevant original manufacturer spread, with its exact size row, spring or orifice legend, hydraulic diagram and drawing. Neighbouring executions apply only to their identified rows. Oil temperature 50 °C and viscosity 30 cSt beside curves are reference conditions, not operating limits.