What size does this US standard correspond to?
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What would it look like if we used domestic data?
It is specified in the DN700 PN20 HG20592 standards
HG20623 contains the flange dimensions; based on these dimensions, one can determine the specifications for the 8-shaped blind plate themselves
There aren’t many domestic data available either; it’s just a 28-inch slip gate. However, you’ve written down the standard incorrectly – the standard for American-style slip gates is ASME B16.48
Without these large-scale data, design it yourself or have the other party provide the drawings
Well, it’s better if the other party provides the specific dimensions and drawings
SB---spectacle blank 8-character blind plate FF-Flat Flange flat flange CL150--ANSI 150 pound class DN700-28 inches