... .Body pattern: Straight, Y type, Angle type 7.Disc type: Plug, Flat, Needle, Regulatingstandard:1,Design and manufacture : GB12239, GB12235 ... abrasion resistant.4.There is nobackward sealing structure in the valve,so the sealing id raliable.5The material of the ... valves,safety valves,ball valves,butterfly valves,diaphragm valves,mud valve ect.And it has complete inspection equipment, such equipments as ...