Oleodinamica Marchesini V0689/300 VMP 1/4 L in-line pressure relief valve

Oleodinamica Marchesini V0689/300 is the VMP 1/4 L in-line pressure relief valve with the actual selected 80–300 bar spring range and standard screw adjustment. Its manufacturer base row specifies maximum flow 30 l/min, maximum operating pressure 350 bar and 1/4" BSP connections. The full supplier-selected code is recorded directly, rather than generated from the ordering options.

Connect P to the pressure line and T to tank. The P connection is reversible. The relief element opens when pressure reaches the adjusted setting. The spring range describes adjustment capability, separate from the component pressure limit and from any delivered preset.

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 0.474 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.