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ASME 31.3 for valves

ASME 31.3 for valves

ASME 31.3 for valves

(OP)
Hello,
we are building sterilizers in Europe. Therefore all our tubes and valves are unlisted according to ASME 31.3. For the tubes it was easy to prove, that they are according to ASME with the calculations in chapter 304. There is a hint in 307 that all valves not listed must be according to 304, but there are no equations for valves, no description what to do, so how can I prove that our unlisted valves can be used in the US?
Anybody out there who is well versed in 31.3 or had the same problem?
Thank you Silje

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