Abstract: Ball valve for high-pressure large-diameter Long-distance pipeline is mainly used in the areas of oil and gas fields as well as long-distance pipelines for connection and disconnection of mediums like oil and gas. It is the key equipment for safe operation of longdistance and high-pressure oil and gas pipelines. The product adopts the full-welding valve body design, a unique sealing structure and self -made sealing materials. The efforts were made for strict control over welded deformation and stable torque. Quality control is assured thanks to innovative metal coating process. Materials and structure are optimized to have better sealing, mechanical and anti-corrosion properties. The company has made innovations in a number of key technologies, such as large wall thickness welding controlling technology for high-pressure full-welding ball valve, ball valve installment precision controlling technology and ball valve high-pressure radial sealing technology. It has also developed the new process for welding the sleeve and valve end, playing an important role in reduction of the engineering cost and acceleration of progress of the project.

Key words: high-pressure, large-diameter, long-distance pipeline, ball valve, sealing structure, mechanical property

摘要： 高压大口径长输管道球阀主要用于油气田、长输管线等领域, 实现对油气等介质的截断与接通操作, 是 长距离、高压输油输气管道安全运行的关键设备。产品采用全焊接阀体设计, 拥有独特的密封结构, 自制密封材料; 严控焊接变形, 扭矩稳定; 创新金属镀层工艺与配方, 严格质量控制; 优化材质和结构, 密封性、机械性能和防腐性 能好。公司在高压全焊接球阀大壁厚焊接控制技术、球阀装配精度控制技术、球阀高压径向密封技术等关键技术方面 有所创新, 研发了袖管与阀端焊接新工艺, 在降低工程造价、加快工程进度方面发挥了重要作用。

关键词: 高压; 大口径; 长输管道; 球阀; 密封结构; 机械性能