Material issues with control valves
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The process medium is 105% fuming sulfuric acid at 130 degrees and 0.35 MPa. The process pipes are made of 20# carbon steel; what material should be used for the control valves? Should the valve body, valve core, valve seat, and valve stem all be made of 20# carbon steel? Is it better to use carbon steel with a fluorine coating for the valve body, and 304 material with a fluorine coating for the valve core, valve seat, and valve stem?
Using 304 for the valve core, valve seat, and valve stem might not be appropriate
The valve body is made of carbon steel, while the valve core is constructed from corrosion-resistant material
The valve body is made of 304 material, while the internal components are made of 304 material that has been hardened; for applications with low pressure, a fluorine-lined version can be used