HYDRAULIC CIRCUIT COMPRISING A MULTIPURPOSE SELECTOR

摘要

The invention concerns an open hydraulic circuit comprising a main pump (P), a hydraulic motor (M), two main supply and exhaust pipes (10, 12) connected to the pump or to a reservoir (R) by a supply selector (14). The circuit comprises a multipurpose valve device including a multipurpose selector (20) for connecting the main pipe at the highest pressure to a pressure control (24) and the main pipe at the lowest pressure to boost means (16) and for connecting the main pipes together them by connecting them to the pressure control when the pressure in said main pipes is substantially equal.