Oleodinamica Marchesini V0725/PP400 differential-area in-line relief valve

Oleodinamica Marchesini V0725/PP400 is the VMPP 3/4 inch differential-area in-line relief valve, offered as this exact article by an independent hydraulic supplier. The selected pressure adjustment range is 50-400 bar and the adjustment is prepared for a sealing cap. The full supplier code is retained; it was not generated from an ordering matrix.

The original 3/4 inch size row gives 120 l/min maximum flow and a 350 bar maximum component pressure. Its spring table separately lists the selected 50-400 bar adjustment range. The spring endpoint is not permission to operate the component above 350 bar; keep the actual setting and application pressure within the component limit.

Connect the pressure line to P and tank return to T, following the original single-relief hydraulic circuit. The 3/4 inch execution uses the P and T arrangement in its own size drawing. The drawing identifies a plugged 1/4 inch BSP pressure-gauge connection. The web-page assembly paragraph describes a different multi-line arrangement; this profile follows the linked original VMPP circuit and P-to-T installation instructions.

The differential-area opening is slower than the standard design but the setting is more consistent as flow changes, according to the manufacturer. This is pressure relief, not a pressure-reducing or pressure-compensated flow-control valve.

The family specification uses a zinc-plated steel body, hardened and ground steel internal parts, BUNA-N seals and a guided poppet with negligible leakage. Mass is retained only as a labelled base-execution reference; exact handknob or cap-option mass is not independently specified. Oil temperature 50 C and viscosity 30 cSt beside the curves are reference test conditions, not operating limits.

The genuine manufacturer family photograph may depict a different adjustment. The local technical PDF retains the full relevant original spread, including the exact size or pressure-range row, adjustment legend, hydraulic circuit, curves and installation drawing. Adjacent executions apply only to their named rows.