ON/OFF valve from size 4 up to 24 inch. Application is highly sour (H2S and CO2 and water and also a little CL). Material that costumer is ordered is A186 F6a for ball and also request for fully stellited of ball. I asked with some ball valve manufacture for fully stelliting of ball but they didn’t accept and do stelliting only contact area (areas contact between ball and seat ring). They don’t consider high corrosive media that cause SCC on ball. My questions are as follow: 1- What are manufacturer‘s limitation for apply stellite overlay on ball? 2- Is there another method instead of stelliting that cover corrosion and erosion concerns?(tungsten carbide and ENP was not accepted by my client because they had bad experience with it in sour service) As for the questions you have raised, (1) can be answered by the manufacturer only and, (2) yes certainly there are valves where internals/sealing parts are made of solid alloy to improve sealing at high DPs and when handling corrosive production fluids. We have several of that kind in the Inlet Reception facilities, mostly level- and flow-control valves. I will try to find the ball valve specification (I have used the word "valve" too many times and I am stopping now) and upload it for your reference.

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