Welded Butterfly Valve 1.Design:GB/T 12238 2.Face to Face :GB/T 13927 3.Inspection:GB/T 12221 Butt-Welded Butterfly ValveCOMPANY ... logo. 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 according ... fields Quality control Scientific research and technology Stainless steel Welded Butterfly Valve