Seeking advice on valve pressure resistance and temperature tolerance; waiting online
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For example, if the superheated steam pressure is 1.6 MPa and the temperature is 400°C, is it appropriate to use a valve with a capacity of 25 kilograms? Should a valve with a higher pressure rating, namely 40 kilograms, be chosen given such high temperatures? I consulted many books but couldn’t find a correlation between valves and temperature.
It’s better to choose 40 kilograms. Your temperature is too high; also, pay attention to the material of the valves.
Temperature is mainly related to the valve material; pressure is secondary.
When choosing this type of valve, it is essential to pay attention to the temperature requirements for its use. Valves must come with a certificate of conformity, as well as instructions, a card, or a label. Selection pressure does not represent its operating temperature. This is because there are requirements regarding the temperature conditions suitable for the internal sealing material of the valve.
ASME B16.34 specifies the temperature and pressure ranges for various valve body materials; check the maximum pressure that the material you intend to use can withstand at 400°C. Check HG/T 20592 in metric units
Valves certainly have a temperature range in which they can function properly; regardless of the pressure rating, using an LNG valve in this environment is definitely not appropriate.
ASME B16.34 – take a look at the temperature and pressure gauges yourself. More reliable than anything else
To meet national standards, one needs to refer to the temperature and pressure standards specified in GB/T12224, determine the appropriate temperature and pressure levels, and then decide which material is suitable
The key factors are the pressure difference and the design pressure of the pipeline; it’s important to choose a manufacturer of steam valves suitable for 40-degree temperatures