Oleodinamica Marchesini RS3-42L metric three-way ball valve — M52 x 2

Oleodinamica Marchesini RS3-42L is a metric three-way ball valve with M52 x 2 DIN 2353 light-series connections for 42 mm tube. The manual L-pattern ball diverts the P supply between A and B; this is a metric tube-connection execution, not the BSP-female version.

The retained original Marchesini sheet prints this exact metric code and its size row. The current factory RS 3 download lists BSP versions only; it is retained as family context and is not used to transfer BSP pressure ratings or dimensions to the metric valve. The original metric sheet is hosted by an independent supplier and is reproduced locally with its manufacturer branding and original table.

The exact metric row gives maximum flow 180 l/min, PN 350 bar and nominal bore 25 mm. The supplier headline states 500 bar, which is not used; the exact original and supplier table agree on PN 350 bar.

The exact original row and selected offer identify M52 x 2 threads. The supplier HTML port cell says M50 x 2; that conflicting cell is not used.

The selected offer explicitly includes fixing holes; the original table gives the mounting-hole diameter. Connect P to supply, A and B to the alternative circuit branches: the factory diagram shows P–A with the lever at 90° and P–B with the lever in line. The image represents the selected metric family; verify size-specific dimensions in the local document.

The local PDF retains the complete relevant original pages, exact size row, hydraulic symbol and installation context. Neighbouring executions apply only to their identified rows. Oil temperature 50 °C and viscosity 30 cSt shown with curves are reference conditions, not general operating limits.