8.2 MPa, steam valve at 350 degrees – what material is suitable for the valve internals, and which standards should be referred to?
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As the title suggests, could experts please recommend some materials as well as relevant standards or information? Thank you all. By the way, is it okay to use 17-4PH for the valve internals?
When used in accordance with ASME specification 17-4PH, the temperature must not exceed 343°C. What type of valve have you chosen for this steam medium?
This post was last edited by chuane on 2019-10-10 09:30. It is recommended to consult the Practical Design Manual for Valves, edited by Lu Peiwen. You also didn’t specify the type of valve you need or its purpose; how can I give you advice then? Is it meant for regulating flow or for shutting off or redirecting flow? . . :)
The valve type is a multi-stage pressure-reducing cage valve, used for regulation
Firstly, is this valve intended for regulation or just on/off control? A three-eccentric valve should work for on/off control, and a ball valve is also an option. For regulation purposes, a globe valve is suitable; for valves operating at 350°C, 316HT or some material with better heat resistance may be required for the internal components.
I checked the design manual; it only mentions a temperature of 400 degrees, with no information on pressure
For control valves, it is recommended to determine the appropriate design temperature carefully; if it is below 343°C, 17-4PH could be considered, while if it is above 343°C, other materials might be suitable