Oleodinamica Marchesini V0489/V180 single-branch motor relief valve

Oleodinamica Marchesini V0489/V180 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 supplier row specifies the execution but does not print the selected spring range. No numeric range or delivered preset is inferred from the digits in its offered code. The adjustment is by handknob.

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.