Oleodinamica Marchesini V0489/180 single-branch motor relief valve

Oleodinamica Marchesini V0489/180 is a single-branch motor relief valve with 1/2" BSP connections. The applicable original V0489 circuit row gives 50 l/min maximum flow and a 350 bar component limit. The exact supplier type explicitly prints the 10-180 bar spring range, matching the original spring table. The adjustment is by screw.

The mounting family is intended for Danfoss OMS motors. Flange M1/M2 to the matching motor interface and connect V1/V2 to supply according to the original drawing. The SE circuit limits pressure in one motor branch; it is not described as the two-branch DE circuit. Named series compatibility does not independently confirm every shaft, port or mounting variant.

This selected circuit is not an SF brake-release or AC anti-cavitation article. Those variants have separate circuit identities; an SF caption elsewhere in a PDF text layer does not add a brake-release port to this assembly.

The original specification uses a zinc-plated steel body, hardened and ground steel internals and standard BUNA-N seals. Mass is a labelled reference for the matching original circuit row, not an independently weighed handknob or sealing-cap option. No delivered preset is inferred from catalogue standard settings. The genuine representative family photograph may show the standard DE or screw-adjusted body; the actual SE/DE/SF circuit and selected adjustment follow the named article and original diagrams.

The local PDF retains the complete relevant original spread, with its exact circuit row, spring/adjustment legend, hydraulic symbol and mounting drawing. Adjacent executions apply only to their named rows. Oil temperature 50 C and viscosity 30 cSt beside curves are reference conditions, not operating limits.