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 project, known as the flushing backhaul control valve group, represents a significant technological advancement. The success of this development is built upon the earlier achievement of the hydraulic hoist system for the Three Gorges Permanent Ship Lock—the largest ship lock in the world—demonstrating the company's expertise in large-scale electro-hydraulic control systems.
This new 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 project. It controls oil pressure, flow, and direction through mechanical leverage, enabling precise motion control. The forging hammer moves up and down as a free fall and vertical lift, allowing for efficient forging operations. As a key component of the 3,000-ton hydraulic block forging machine developed for Liaoyang Heavy Industry Group, this valve group is characterized by high technical standards, fast response times, and a high level of integration. Its development is rare among domestic manufacturers, as similar equipment was previously imported.
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. Following the successful bidding of Haiyue Company, the hydraulic hoist system for the Three Gorges Permanent Ship Lock was developed and has been operating continuously for over 1,865 days.
In early 2007, Haiyue Company was tasked with localizing supporting equipment for Liaoyang Heavy Industry Group. As part of this initiative, they developed two sets of punching systems, further showcasing their capability in advanced hydraulic solutions. This project not only marks a milestone in domestic hydraulic technology but also highlights the growing self-reliance of Chinese manufacturers in critical industrial applications.
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