I am 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".
I could only locate Raimondi and Intervalve of Tyco.
Except Tyco group, are there any other vendors that you could advise?

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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