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GLZ Series High Pressure Flow Auto Controller (hereafter we call GLZ) is the high-tech product of mechanical and electrical integration, which is invented and manufactured by Shanghai Yinuo Instrument Co., Ltd.( Invention Patent No.: 200610046132.3 & Utility Model Patent No.: ZL-2004 2 0031280.4). It assembles the high pressure flow meter, high pressure flow control valve and flow controller. There are the features of compact structure, easy operation, visual display, higher accuracy, corrosion proof, fouling prevention, dual-purpose of alternating and direct current and manual or automatic flow control, etc. It is suitable for higher pressure water injection and the project of polymer injection, especially for waterflooding.