关键词: 高压; 大口径; 长输管道; 球阀; 密封结构; 机械性能

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