The B16.34 Special Class Table valves. the Valves in question are CL1500 special class. If it is possible, what would a vendor or end user have to do to document going to working pressures that are above the special class valves. I assume that you already have the valve operating, otherwise you would just have bought a class 2500 valve. Additionally I expect that you already have checked your piping and flanges, because they are very likely also rated for class 1500. In case the valve is the bottleneck, you can ask the manufacturer if he can 'upgrade' the plug valve design pressure. This is sometimes possible in case materials with a high yield strenght were used. Note that the valve no longer complies with ASME B16.34. The manufacturer must use a different design criteria (like DIN standards) and change all valve pressure information (documentation / tagplates). As the enduser you must thrust the manufacturer to do a good job and agree with the new design criteria. 'Upgrading' is not so easy, especially when you increase the design pressure for more than a few bar.

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