A350 and super duplex

I have been offered needle valves with A350 body, for OS&Y bolting,
supplier suggests super duplex bolts instead of L7.
Will it represent galvanic corrosion problems ?
Thank you,
Reply to
Vietnam
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IMHO, minor - the super duplex needle stem is cathodic with respect to the A350 valve body (anode) - the valve body has the larger surface area - same area effect as seen in the use of brass valves in domestic water service with A53 steel pipes. BTW - the properties of the fluid that valve control will constitute the dominate corrosion mechanism(s).
Ed Vojcak
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Ed

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