| 摘要 |
PURPOSE:To aim at saving energy and to smoothly operates all controlled systems, by feeding a predetermined pilot pressure to a flow control section for a pump through a selector valve which is changed over in association with a selector valve upstream of ganged selector valves. CONSTITUTION:A selector valve 16 which is controlled to be changed over in association with an upstream selector valve 12, is connected to the latter, and therefore, a predetermined pilot pressure is fed into a flow control section 26 for a pump 10 through the selector valve 16. With this arrangement, when ganged selector valves are set at their neutral position, the discharge amount of the pump 10 may be reduced so that it is possible to aim at saving energy, and further, upon maximum discharge of the pump 10, controlled systems connected respectively to the ganged selector valves may be all smoothly controlled to be operated. |
