Oleodinamica Marchesini V0688/V180 in-line pressure relief valve

Oleodinamica Marchesini V0688/V180 is a VMP L D5 1/4-inch BSP in-line pressure relief valve with handknob adjustment. The exact full order code is independently listed by Hikom. The current factory size row gives maximum flow 30 l/min and a component pressure limit of 350 bar. The pressure limit is retained as a labelled current-edition reference, rather than an independently established rating for the supplied legacy execution.

Connect the pressure line to P and the return line to T. The manufacturer describes the P connection as reversible. At the adjusted setting the relief element opens to tank to limit circuit pressure.

The exact supplier execution follows the legacy V0688/180 family: its original manufacturer sheet prints COD/180 as 10-180 bar and explicitly lists handknob and sealing-cap options. The current original instead restricts V0688 spring choices to 10-15, 10-190 or 80-300 bar. These editions are not treated as aliases; no selected spring range or delivered preset is assigned as a numerical filter.

The body is zinc-plated steel, with hardened and ground steel internals and standard BUNA-N seals. The factory describes a guided poppet with negligible leakage. The image is a representative manufacturer family photograph; the actual adjustment follows the exact supplier article and identified original edition. Mass and envelope or cavity dimensions are not transferred between different catalogue editions or adjustment options.

The local documentation should retain the complete current original spread and both pages of the supplier-linked legacy original, with their respective execution differences identified. Neighbouring sizes and alternative settings apply only to their named rows.