Oleodinamica Marchesini V0421/RP18 double counterbalance valve for closed-centre circuits

Oleodinamica Marchesini V0421/RP18 is the 3/8-inch BSP double VBCD type A counterbalance-valve execution for closed-centre hydraulic circuits. The complete article is explicitly listed on the current manufacturer series page and as an actual Hikom catalogue item. Hikom explicitly states pilot ratio 1:8 for this exact full order code.

The family controls actuator movement and retains an overrunning load in both directions. Its closed-centre design is described by the manufacturer as insensitive to back pressure. Connect V1 and V2 to the supply and C1 and C2 to the actuator ports, following the family circuit. The mounting is in-line.

The shared family construction uses a zinc-plated steel body, hardened and ground steel internals and standard BUNA-N seals. The representative manufacturer family photograph identifies the family; it does not certify the geometry or internal pilot construction of this exact RP18 execution.

The linked original manufacturer sheet documents the base family and prints 1:4.5 base rows. Those rows do not establish the pressure rating, maximum flow, calibration, mass or dimensions of this 1:8 article. These variant-specific values remain unassigned. The supplied pilot ratio is identified as supplier-stated and is not replaced by the base-table ratio.

The local PDF retains the complete original family reference with a clear applicability note. It supplies the family operating principle and material reference, and is not an RP18-specific dimensional drawing, rating certificate or confirmation of a delivered pressure setting.