Zhejiang Naishi Valve Co., Ltd. is a ball valve factory that never stops innovating. Inside this ball valve factory, engineers push the boundaries of metallurgy to create valves that endure 600 °C and pressures up to 4500 Lb. The design floor of the ball valve factory is alive with 3-D modeling software that turns concepts into floating, fixed, welded, and DBB double ball valves within...