| 摘要 |
The invention relates to a hydraulic circuit which makes it possible to perform maintenance on a stack valve of the hydraulic circuit and to perform various functions such as flushing of the circuit and a trial run in parallel with the maintenance, and relates to a composite valve used in the hydraulic circuit. In the hydraulic circuit, the composite valve is interposed between the stack valve and a hydraulic power supplier and between the stack valve and a multifunction valve coupled to a hydraulic device. The composite valve includes: stop valves opening/closing communication between the hydraulic power supplier and the stack valve and stop valves opening/closing communication between the stack valve and the multifunction valve; and bypass circuits including stop valves opening/closing communication between the hydraulic power supplier and the multifunction valve, the bypass circuits provided closer to the hydraulic power supplier than the stop valves. This structure makes it possible to perform repair, checking, and/or maintenance on the hydraulic power supplier and the stack valve; flushing; and repair, checking, maintenance, and/or a trial run of the hydraulic device, simultaneously. The composite valve has uniform circuit configurations, which facilitates production of the valve. |
