| 摘要 |
<p>PROBLEM TO BE SOLVED: To actualize the control of a two flow-way pump and a tandem pump only by making a small change to the configuration of a hydraulic circuit having a simplex pump. SOLUTION: A pressure reducing valve 5 is provided for pressure air feeding pipelines 4 (41 and 42), out of the pressure reduction valve 5, pressure oil PE indicating pressure (P1+P2)/2 (average pressure of P1 and P2) higher than the minimum pressure out of respective pressures P1 and P2 discharged out of the respective discharging ports 1b and 1c of a hydraulic pump 1, is inputted to a PC valve 19 as driving pressure oil by way of a branch pipeline 45, and concurrently, it is also inputted as pilot pressure oil by way of a branch pipeline 4e.</p> |
