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Does anyone know why this situation has occurred with the flange in the picture? Flanges of the same specification and model can have different sizes and thicknesses
Ask the valve manufacturer which standard applies to the flanges; check against the relevant standards and measure the dimensions to determine whether it is a qualified product
It must be that the flange standards are different. .
Some manufacturers produce flanges whose tolerances exceed the standard range in order to reduce energy costs; for example, the outer diameter might have a tolerance of -5 and the thickness a tolerance of -3. When flanges of the same specification are manufactured by different manufacturers, differences in tolerances can lead to such outcomes.
There are issues with the selection of pressure rating and flange standards
There must be a problem with the ball valve flange standards. It differs from the original pipeline valves, which is due to selection considerations or the desire to save materials.
Different materials may not be suitable for use; for example, iron and stainless steel can be the case. Different weights can also lead to this issue, and it can happen as well with different manufacturers
Issues regarding pressure ratings and flange standards