Oleodinamica Marchesini V0577 VRFB 90° 1 bidirectional flow control valve

Oleodinamica Marchesini V0577 (VRFB 90° 1) is a bidirectional flow control valve. The factory lists a 300 bar working-pressure limit. Maximum flow is 110 l/min, with 1 inch BSP ports arranged at 90 degrees. This execution has no pressure compensation; flow changes with pressure difference and oil viscosity.

The needle meters flow in both directions and has no reverse-flow bypass check. Either connection may face the supply. If a pilot-operated check valve is also fitted, place the regulator between it and the actuator. The English factory text specifies minimal closed-valve leakage; do not assume a certified positive isolation function.

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 VRFB 90° series. Port sizes and execution details depend on the exact article; use its factory table and original drawing in the local PDF.