I'm looking references for comparison casting valves versus forging valves. Does anyone have the Links or book-reference?There must be many links. Are you looking for a comparison of the manufacturing processes; or aspects such as the reliability of the end products?Cast valves have much greater porosity than forged valves and fittings. This could be an issue in hydrogen service where the small molecules could pass through the pours. Cast valves are made by pouring molten metal into sand molds. Forged valves are beaten into shape from solid blocks of metal. Only an analyzis of failure rate, type and probabel cause could give you a startpoint for improvement. Start with this.If you have a too high failure rate, my tip is to check your QA-system and procedures as next step. First when you have established that you a have procedure and a control system that works, is the time to go for metallurgy and casting processes improvement.

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