| 摘要 |
A fluid pressure control device (100) for a construction machine includes a first circuit system (10) connected to the first pump (P1); a second circuit system (20) connected to the second pump (P2); a switching valve (25) having a normal position (A), a straight traveling position (B) and a merging position (C) where the working fluid of the branch section (13a) is merged into the second neutral passage (21); and an open/close mechanism (14) configured to open/close the first neutral passage (11). In a case where at least one of the control valves (222, 223, 224), on which merging is required, on the downstream of the second traveling control valve (221) is switched to a position other than the neutral position, by closing the first neutral passage (11) by the open/close mechanism (14) and switching the switching valve (25) to the merging position (C), the working fluid of the first pump (P1) is merged into the working fluid of the second pump (P2). |
