The first domestically developed equipment for 250 mm diameter two-way cartridge valves, created by CSIC Haiyue Company, has successfully completed the flushing backhaul control valve group project and passed user acceptance. This marks a significant milestone in China's hydraulic control system development.
The successful realization of this project builds upon the earlier achievement of the hydraulic hoist system for the world's largest ship lock—the Three Gorges Permanent Ship Lock—part of the Three Gorges Project. The new flush return control valve group represents another major breakthrough in the research and development of large and medium-sized electro-hydraulic control systems.
This advanced valve group uses a 250 mm diameter two-way cartridge valve, which is twice the size of the 125 mm valves used in the Three Gorges ship lock. It controls oil pressure, flow, and direction through mechanical leverage. The forging hammer operates with a free fall and vertical lifting motion to perform precise forging actions. As a key component for Liaoyang Heavy Industry Group, it is installed in a 3,000-ton hydraulic block forging machine. The system features high technical standards, fast response times, and a high level of integration, surpassing 80 mm in performance. Such advanced valve groups are rarely produced domestically, and previously, similar equipment had to be imported.
The 704 Hydraulics Institute has a long history in hydraulic technology. Since the 1980s, it has been developing and producing two-way cartridge valves. The hydraulic hoist system for the Three Gorges Permanent Ship Lock was developed after Haiyue Company won the bid. The system has been in operation for over 1,865 days without major issues.
In early 2007, Haiyue Company took on the task of localizing supporting equipment for Liaoyang Heavy Industry Group, further strengthening its position in the domestic hydraulic control industry. This latest project not only demonstrates technological independence but also enhances China's capability in high-precision hydraulic systems.
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