Shengji News

    The front and rear reducer of the regulating valve is to improve the regulation performance. Generally, the caliber of the regulating valve is one to two grades smaller than that of the pipeline. The front reducer of the valve is to increase the pressure in front of the valve so as to make the regulation more sensitive and realize the automatic regulation better. The rear reducer of the valve is to reduce the pressure of the outlet pipe. Reducing plays a throttling role. Generally, the pipe diameter of the regulating valve is the same as that of the pipeline, but the most rigorous method is to calculate the size of the regulating valve according to the CV value of the regulating valve, which can save some investment. The large and small heads are used to change the diameter. The flow state of the regulating valve is better, and the control accuracy is relatively accurate. The use of eccentric reducer can prevent the pipeline at both ends of the regulating valve from accumulating liquid. The purpose of reducing pipe is to improve the accuracy of regulation. In addition, the regulation speed and the cost of regulating valve are also included. Reduce the cost and improve the control sensitivity. If the regulating valve is as large as the pipeline, it means that either the pipeline diameter is small or the regulating valve is large. Because the regulating valve is much more expensive than the ordinary valve (generally more than 10 times), it needs to be reduced under normal conditions, and reduced to 1 ~ 2 below the pipeline diameter. Excessive reduction will cause excessive pressure loss and pipeline noise , strong vibration. The low flow rate through the regulating valve is not conducive to regulation and has poor sensitivity.