The II series pipeline corresponds to the national standard valve, and the I series corresponds to the American standard valve?
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The II series pipeline corresponds to the national standard valve, and the I series pipeline corresponds to the American standard valve? Is this correct?
I series and II series correspond to different outer diameter series. It has nothing to do with the valve.
How does the valve flange correspond to the pipeline?
The flange of the valve must match the flange of the valve body, generally the same standard is selected. The wall thickness of the pipe end flange should be consistent with the pipe wall thickness. The I series and II series of pipelines refer to the large and small diameters of the pipelines, so when selecting the corresponding flange, you should also choose the same diameter and wall thickness.
This kind of problem mainly requires attention when using wafer-type valves!