... chromate plating 3.ISO9001:2008 Brass Ball Valve 1. Product IntroductionItem DescriptionNameBrass Ball ValveMaterialBrass, CopperSurface TreatmentZinc plating or ... Ltd.(2) Main products: CNC machining precision parts: valve accessory, brass tube fittings, elbow, tee, nut; ... devices: digital projector, Rockwell hardness tester, hydraulic valve test bench, micrometer, thread ring gauge and plug ...