Oleodinamica Marchesini V0490/SF VAU 1/2 DE OMS SF cross-line relief valve

Oleodinamica Marchesini V0490/SF (VAU 1/2 DE OMS SF) is a cross-line relief valve with a maximum flow of 50 l/min and a maximum operating pressure of 350 bar. The factory-listed mass is 1.326 kg. The maximum pressure is a component limit, distinct from the selected spring range and actual relief setting.

The valve mounts directly on Danfoss OMS motors. Match the original flange drawing, oil passages and sealing seats to the motor before installation; a matching family name alone does not establish compatibility with every motor execution.

The DE circuit limits both motor lines through two relief branches.

The /SF execution adds a G 1/8 brake-release port shown in the original hydraulic diagram. It is not the /AC anti-cavitation execution.

Connect M1/M2 to the motor and the G 1/2 V1/V2 ports to the supply. Optional spring ranges and pressure-setting variants shown in the family document are not additional generated articles.

Internal parts are hardened and ground steel, with standard BUNA-N seals and a guided-poppet construction. The original pressure/flow curves use oil at 50 °C and 30 cSt; these are curve reference conditions, not an established operating-temperature range. Use the local full spread for the applicable circuit, dimensions, spring tables and installation conditions.

The manufacturer photograph represents the series. The local PDF retains the relevant original article tables and drawings unchanged.