Oleodinamica Marchesini V0990/CA open-centre four-way reversing valve

Oleodinamica Marchesini V0990/CA is a open-centre four-way reversing valve with 3/4" BSP connections, 120 l/min maximum flow and a 250 bar component limit. The full offered code is explicitly listed by the factory and supplier. The original V0990 size row supplies the body rating; the printed CODE/CA open-centre legend defines the selected centre execution.

Connect P to pressure, T to return and A/B to the actuator or motor. In one working position P feeds A and B returns to T; in the other P feeds B and A returns to T. The selected /CA centre is open, as shown in the optional diagram. The unsuffixed IF 4 standard centre is closed and is not used to describe this /CA article.

The body is cast iron, with hardened and ground steel internal parts and standard BUNA-N seals. The factory describes minor internal leakage; the diverter is not represented as a certified zero-leak load-holding valve. Unqualified envelope dimensions are omitted where legacy text layers and the visible drawing differ. Any base-row mass shown is labelled as a base-execution reference.

The local technical PDF retains the complete relevant original manufacturer spread, including the size table, option legend, hydraulic circuit and drawing. Neighbouring executions apply only to their identified rows. Oil temperature 50 °C and viscosity 30 cSt shown beside curves are reference conditions.