On October 2, 2012, the fully welded pipeline ball valve with a diameter of 40 inches and a pressure of 900 Lb, which was trial-produced by Shanghai High and Medium Pressure Valve Co., Ltd., passed the three tests of air pressure sealing, hydraulic sealing and strength, and was successfully developed. The entire trial production work from project establishment to the final trial production success. After 7 months, the group and company leaders paid great attention to the entire trial production work and provided huge support. The various departments of the company cooperated and cooperated closely. All members of the trial production team Serious and rigorous, hard-working, and overcome one difficulty after another, the one-time success of the whole trial production fully demonstrates the spirit of innovation and continuous improvement of Shangfan people. The large-diameter fully welded pipeline ball valve is the need of the future development of Shanghai High and Medium Pressure Valve Co., Ltd., and the need of the market. Its successful trial production has demonstrated the technical research and development strength of Shanghai High and Medium Pressure Valve Co., Ltd. in the industry and improved the product structure. Enhance the market competitiveness of products and lay a good foundation for Shanghai High and Medium Pressure Valve Co., Ltd. to make a new leap.