In addition to considering the corrosion performance, flow characteristics, and connection form of the medium, the temperature and pressure of the medium are important parameters when selecting valves. It is also necessary to consider the relationship between valve temperature and pressure: the temperature and pressure of valve use have a certain internal connection and mutual influence. Among them, temperature is the dominant factor, and a valve with a certain pressure can only adapt to a certain temperature range. Changes in valve temperature can affect the valve's operating pressure.
For example, the nominal pressure of a carbon steel valve is PN100; When the working temperature of the medium is 200 ℃, its maximum working pressure is 10MPa; When the working temperature of the medium is 400 ℃, its maximum working pressure is 5.4MPa; When the working temperature of the medium is 450 ℃, its maximum working pressure is 4.5MPa.
Select valves based on pressure temperature and its level relationship
The operating temperature and pressure of a valve are determined by the material used to manufacture the valve. The operating temperature and pressure of valves made of different materials, as well as their relationship, are as follows (the pressure referred to in the following table is the gauge pressure, and the maximum working pressure refers to the non impact gauge pressure. When the operating temperature is the middle value of the temperature level in the table, the working pressure can be determined using the interpolation method):
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