Oleodinamica Marchesini V0581 VRFU 90° 1/4 unidirectional flow control valve

Oleodinamica Marchesini V0581 (VRFU 90° 1/4) is a unidirectional flow control valve. The factory lists a 350 bar working-pressure limit. Maximum flow is 15 l/min, with 1/4 inch BSP ports arranged at 90 degrees. This execution has no pressure compensation; flow changes with pressure difference and oil viscosity.

The throttle meters flow from C to V and the internal check provides a free-flow path from V to C. The check opening pressure is 0.5 bar. Connect V to supply and C to the actuator. When used with a pilot-operated check valve, install the regulator between that valve and the actuator.

Loosen the side locking screw before turning the hand knob, then secure the setting. The 1/4, 3/8 and 1/2 inch standard versions use a blue plastic knob; an aluminium knob is a separately ordered /AL execution and is not implied by these unsuffixed article codes.

The manufacturer specifies a zinc-plated steel body with hardened and ground steel internal parts. Standard seals are BUNA N. The local technical reference contains the complete relevant factory spread, including the code table, hydraulic schematic, dimensions and applicable operating conditions. Representative manufacturer product image for the VRFU 90° series. Port sizes and execution details depend on the exact article; use its factory table and original drawing in the local PDF.