Cast Iron for Butterfly  Valve Body for PN25 DN500-1600? do you have better material to recommend to me? what's the advantage of the material which you recommend? Your answer will be high appreciated.
You can use cast iron for the design of a pressure vessel such as a Butterfly valve and the sizes and pressure you mentioned and this has been done by many valve manufactures, however it is not possible to generalise. You must look at more than just the pressure loading, piping end loads and operting torques must be considered. As you are looking at a brittle material you need to consider any potential shock that the valve could suffer.In summary if the valve is designed correctly then you will have no problems with cast iron.
To look at the mechnaical properties of cast iron you could reference BS EN 1561 and have a look through the grades.
Another possibility could be SG Iron which offers better mechanicals but at a cost.

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