Oleodinamica Marchesini V0689/180 VMP L 1/4 lightweight relief valve - screw adjustment

Oleodinamica Marchesini V0689/180 is a VMP L 1/4 lightweight relief valve with 1/4" BSP connections, a 10–180 bar spring setting range and screw adjustment. Its manufacturer base designation is V0689. The full order code is listed by the supplier; the manufacturer sheet confirms the base valve, spring range and control option.

The applicable factory base has a maximum operating pressure of 350 bar and a maximum flow of 30 l/min. The 180 in the offered code identifies the upper spring-range value in that supplier offer; it is not a confirmed 180 bar factory preset or the maximum component pressure. The original standard-setting reference for this range is 90 bar. Confirm the actual delivered setting separately.

The lightweight VMP L valve limits pressure in one line by opening a path to tank when its setting is reached. Connect P to the pressure circuit and T to tank; the factory describes the P connection as reversible. The 1/4 and 3/8 executions have different maximum flows and body dimensions, so use the exact base row in the local document.

This is the standard screw-adjusted execution. The factory base-table mass is 0.474 kg. Optional handknob, sealing-cap and other spring-range executions are not added by inference.

The body is zinc-plated steel with hardened and ground internal parts and standard BUNA-N seals. Base body dimensions are labelled as reference body dimensions; no adjustment-dependent overall envelope is inferred. Pressure/flow curves use oil at 50 °C and 30 cSt, which are curve reference conditions rather than an operating-temperature range. The local PDF retains the complete relevant original spread, including its ordering notes and spring table.