Collecting offers for high pressure valves for steam lines in natural gas power plant. Most manufacturers are limited to Class 2500 but I am looking for manufacturers who can build till Class 4500 and also using forged material.
Sizes are around 4-6-8". Aceco (acecovalves.com) makes high pressure ball valves using 4340 forged bar, up to 10 or 11,000 psi.  They aren't flanged-end though, they're what is called "compact manifold valves" for use in oilfield piping systems.  You can get them with weld-end attachments, but I don't know if they have flanged-ends or not.If it is a control valve that you are after, Severn Glocon / Severn Unival have manufactured valves to API10000 and 15000 (so up to 15000 psi rated) from block forgings and hipped material. They specialise in 1-offs, so may be able to help with an ANSI 4500 rated valve.

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