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DBB Ball ValveEach DBB Ball Valve manufactured by huachao valves has good quality. We have manufactured and distributed more than 30000 of these units worldwide, and worked with some of the large oil and gas projects in the world. We offer our innovative DBB solution on a variety of our valves, including forged Double Block and Bleeds, instrument Double Block and Bleed’s injection and sampling Double Block and Bleed’s.Hot tags: Double Block Bleed Valve, China, mill, manufacturer, supplier, factory, wholesale, cheap Injection Sampling DBB Ball ValveHuachao offer both Sampling and Injection Valv