Selection description of driving valve

1、 Valve selection steps: 1 According to the valve pressure, caliber, and the temperature of the medium, the appropriate valve model can be selected 2 Knowing the connection mode of the pipeline and the diameter of the valve can determine the connection mode of the valve 3 If you know the purpose of the valve and the conditions of the production process, you can determine the driving device of the valve 4 The general valve diameter is the diameter of the pipeline, but there are also valve diameters that are actually used according to the pipe diameter 5 To determine the sealing surface of the valve, it is necessary to know the medium, temperature and pressure value of the valve The high service temperature of Zui of the valve body must be higher than the medium temperature 6 The nominal pressure of the valve shall be determined according to the material of the valve body, the working pressure and temperature of the medium 7 The medium characteristics, working pressure and temperature of the valve can be used to select the model and sealing surface 2、 Valve selection example: the working pressure of the steam pipeline is 13 kg, the temperature is 350 ℃, and the caliber is 100 What kind of valve should be selected From the above known conditions, first determine the material of the valve body Since the steam pressure is 13 kg and the temperature is 350 ℃, you can choose ductile iron or cast steel However, considering the temperature of 350 ℃, nodular cast iron is relatively difficult to choose, so for the sake of safety, cast steel valves should be selected Then from the analysis of pressure, according to the pressure and temperature of cast steel and account period, the valve should be 16 kg or 25 kg Next is the selection of sealing surface, to choose stainless steel The given valve diameter is 100, and the pipe diameter is relatively small, so the opening and closing time and torque are not large, so it is OK to choose the manual one Generally, the steam pipes are made of seamless steel pipes, while the seamless steel pipes are all welded However, in order to make the valve easy to install and maintain, it is recommended to use flange connection From the above analysis, we can determine the type of valve Basically, stop valve and gate valve can be selected Under the same pressure level, the cost performance of gate valve is higher than that of stop valve, so it is better to choose stop valve So the model of Zui rear stop valve is j41h-25c DN100.