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Kaifeng high pressure valve research and development of large diameter electric gate valve new products
In November 2007, the R&D center successfully developed a new large-diameter F91 electric gate valve for the 600MW supercritical unit at Changzhou Power Plant. This marked a significant milestone in the company's product development, as it also included a forged gate valve designed for a 1000MW unit at Huadian Zouxian Power Generation Co., Ltd. In addition, the team worked on a WB36 tailor-welded forged gate valve for a Beijing-based company, as well as high-grade valves made from CF8C and F321 stainless steel for another large-bore application.
Later that same month, representatives from Changzhou Power Plant, including senior management, visited the company to conduct a thorough inspection. They met with key departments such as technical, material, sales, production, operations, and quality control. During the visit, they discussed various aspects of the products, including design specifications, quality management, material procurement, production processes, delivery timelines, and past performance of the F91 valves. The visit ended with a positive assessment of the company’s capabilities, and the leaders expressed confidence in the high-quality performance of the large-diameter F91 electric gate valves.
Following the visit, the company received confirmation that it had secured a supply contract for 10-inch and 18-inch F91 forged gate valves for Changzhou Power Plant. This was a major win, demonstrating the growing trust in the company’s technical expertise and product reliability.
The design parameters for the large-diameter F91 electric gate valve were quite demanding. For the main steam pipeline, the valve operated under a pressure of 25.4 MPa and a temperature of 576°C, with a pipe size of 230×29 mm, using ASTM A335 P91 material. On the hot reheat pipeline, the conditions were slightly less severe, with a pressure of 5.042 MPa and the same temperature of 576°C, but with a larger pipe size of 415×20 mm, still made from ASTM A335 P91. These specifications highlighted the advanced engineering required to meet the strict demands of power generation systems.