Regarding flange specifications
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The pipe flanges are of CL150 grade, while the valve flanges are of CL200 grade. Without considering safety factors, can valves of this specification be installed on the pipes?
Different grades result in different sizes for the sealing surfaces and bolt holes
Due to different pressure ratings, the center distances between bolt holes vary, which prevents the pipeline flanges from being connected to the valve flanges.
This post was last edited by Dugu Lingyun on 2019-12-10 at 20:46. Is there a pressure rating called CL200? I couldn’t find flanges of this grade
According to the parameters in HG21615, there is no CL200 level
They must be of the same grade; when purchasing valves, the corresponding pipe fitting specifications should be provided to the manufacturer
Are you sure there is a pressure rating of CL200? CL150，300，600，900.....
Thank you all for your replies. I was mistaken; there is no CL200 version. What I meant was whether connections are possible given the different flange pressure ratings
Under normal circumstances, valves cannot be installed if the pressure ratings differ; however, in special cases, it is possible to check whether the connection dimensions between the valve flange and the pipe flange are the same for different pressure ratings, but such a possibility is very low.