Has anyone heard of High Pressure Isostatic Pressing being used a method of manufacturing valve bodies especially in duplex construction?If so:- names of reputable valve mnaufactuers capable of it will be appreciated, based on previous experience- does HIP'ing take a longer manufacturing time compared to castings- Does it cost more compared to castings, though I suspect it does.Perhaps you meant Hot Isostatic Pressing.I have heard it was used for lining of valve bodies to face wear or corrosion issues, just applying a layer of corrosion-resistant material only where it was really required.Do not know whether they have experiences with valve bodies, but I would give a shot to this.HIP is used for valve bodies, as evidenced by ASTM A988, but it will not be valve manufacturers undertaking the process, it will generally be subcontracted. For duplex SS, there are several schools of thought, for example, BP prefer HIP for duplex, an Australian operator prohibits HIP for duplex. BP reckon it is superior to castings and forgings, the Australian operator reckons that deleterious phases are more prevalent.

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