: External and internal sizes, diameters, and radii. Angular Dimensions : Machined angles and corner roundings.
The reference typically refers to the MSS SP-81-2021 standard, which governs the design and testing of bonnetless, stainless-steel, flanged-end knife gate valves. Overview of MSS SP-81-2021 ms812021 standard pdf
These are more rigorous tests often specified in the standard for high-performance applications, measuring the filling ability and passing ability in a simulated confined channel. : External and internal sizes, diameters, and radii
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: Users have uploaded various versions and revisions of "MS81-2029" and related machining standards (like MSF1 2021e) as PDFs for online viewing. : External and internal sizes
