Dumping Ball Valve 1.Design and Manufacture:GB12237 2.Face ... 79.1--94 4.Inspection:GB13927 Dumping Ball ValveCOMPANY INTRODUCTION:Zhengmao Valve Co., Ltd is founded in 1992. ... Now, we can provide with Ball Valve, Gate Valve, Globe Valve, Check Valve, Butterfly Valve, Slurry Valve, Feed Valve, Stop Valve and so on.They are produced ... Scientific research and technology Stainless steel Dumping Ball Valve