one. Valve selection steps:
1. According to the pressure of the valve , the caliber, and the temperature of the medium that has gone, you can choose the appropriate valve type.
2. Know the connection method of the pipeline and the diameter of the valve to determine the connection method of the valve.
3. Use of the valve If you know the conditions of the production process, you can determine the drive of the valve.
4. The general valve diameter is the diameter of the pipe, but there are also the 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 what the medium is going to be, the temperature and the pressure value. The high temperature of the valve body must be greater than the medium temperature.
6. The nominal pressure of the valve is 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 selected to select the model and sealing surface.
two. Valve selection examples:
The working pressure of the steam pipe is 13 kg, the temperature is 350 degrees Celsius, and the caliber is 100. What kind of valve should be chosen.
Under the above-mentioned known conditions, the material of the valve body is first determined. Since the steam pressure is 13 kg and the temperature is 350 degrees Celsius, it is possible to select ductile iron or cast steel. However, ductile iron is more difficult to choose from the temperature of 350 degrees Celsius, so in order to safety, cast steel valves should be used. Then from the pressure to analyze, according to the pressure temperature of the cast steel and the account period, the valve should choose 16 kg or 25 kg. Next is the choice of sealing surface, stainless steel. The given valve has a diameter of 100 and the diameter is relatively small, so the opening and closing time and torque are not large, so you can choose manual. Generally, steam pipes are made of seamless steel pipes, and seamless pipes are welded. However, in order to make the valves easy to install and maintain, it is recommended to use flanges.
The information obtained from the above analysis can be used to determine the type of valve. Basically available shut-off valves and gate valves. Because the cost performance of the gate valve is higher than the shut-off valve under the same pressure level, it is better to choose the shut-off valve. Therefore, the model of the shut-off valve after the Zui is J41H-25C DN100.
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