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what is the deference between full vacuum check valve internal valve materials and normal check valve

I'd like to know the plate & spring bearing materials and the hinge/stop pin materials on full stellite trim for carbon steel A216 WCB check valves wafer type dual plates design? Thanks in advance

ASME B16.5 item 2.5.2 confirm that for class above 150 the flanged joints may develop leakage at temperature above 400°c

as per ASME B16.5 item 2.5.2 that at temperature above 400°c for class above 150 flanged joints may develop leakage.

three pieces valves (bolts b7) at design temperature 410°c has been rejected by our client due to ASME b16.5 which confirm that the maximum temperature can be used in bolted joints are 400°c, there is any code allow us to use this three pieces valves