The first 250mm two-way two-way cartridge valve was successfully developed.
The first domestically developed equipment for 250 mm diameter two-way cartridge valves, created by CSIC Haiyue Company, has successfully passed user acceptance. This is part of the flushing backhaul control valve group project, which demonstrates excellent performance and marks a significant advancement in hydraulic control technology. The successful development of this system builds upon the earlier success of the hydraulic hoist system for the Three Gorges Permanent Ship Lock, the world's largest ship lock, as part of the Three Gorges Project. This achievement represents another milestone in the research and development of large and medium-sized electro-hydraulic control systems.
The flush return control valve group utilizes a 250 mm diameter two-way cartridge valve, which is twice the size of the 125 mm valves used in the Three Gorges hydraulic hoist system. It controls oil pressure, flow, and direction through mechanical leverage, enabling the forging hammer to perform both free-fall and vertical lifting motions, thus achieving precise forging actions. As a key component developed for Liaoyang Heavy Industry Group and installed in a 3,000-ton hydraulic block forging machine, this valve group is characterized by high technical demands, fast response times, and a high level of integration. Its development is rare among domestic manufacturers, as similar equipment was previously imported from abroad.
The 704 Hydraulics Institute has a long history in hydraulic technology. Since the 1980s, it has been at the forefront of 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, and the system has been operating continuously for 1,865 days.
In early 2007, Haiyue Company was tasked with localizing the supporting equipment for Liaoyang Heavy Industry Group, leading to the development of two sets of punching systems. This project not only showcased the company’s technical capabilities but also marked an important step toward reducing reliance on foreign technology in critical industrial applications.
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