Shengli Oilfield Gudong plant three mining center recently successfully developed a balanced low-cut-off valve, the oil field injection pump at the same time to multiple wells injection possible. Due to the large mechanical shear viscosity loss of the polymer, it is required that the regulating valve be fully or fully closed during delivery of the polymer medium which would otherwise result in substantial polymer shear, so usually the injection pump will only give one injection well Provide polymer mother liquor. To this end, the center uses a conical design, the seal at the valve core and the use of surfacing alloy material, so that has a strong erosion resistance, to ensure the sealing of the valve. Valve drive system with step-down sealing technology to ensure flexible valve adjustment. Tests show that the valve has a mother liquor regulation accuracy, easy to operate on site, high viscosity retention characteristics. Control valve opening in full, 2 / 3,1 / 2, 1/4, the viscosity retention rate of 98% or more. At present, the control valve has declared the national patent.
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