Oleodinamica Marchesini B8500 is a valve mounting flange for the VBCD DE FL overcentre-valve interface. The current factory drawing explicitly identifies B8500 as the base for V0385, V0424 and V0434; compatibility with the larger V0447 is not claimed.
The original base drawing gives a 100 mm length, 55 mm height and 25 mm thickness, a 48 mm mounting reference, 9 mm through-hole designation and M8 threaded fixation. These are the accessory dimensions, separate from the valve-body table above.
This is the mounting flange, not a complete pressure-control valve. The valve table pressure, flow, pilot ratio, standard setting and valve mass are not assigned to this accessory. The factory sheet does not separately establish its material grade, mass or standalone pressure limit, so those are omitted.
The local PDF preserves the relevant original manufacturer pages and exact article or accessory drawing. Neighbouring assemblies and options apply only to their identified rows. Any 50 °C oil temperature and 30 cSt viscosity shown beside curves are reference conditions, not general operating limits.
