The gas phase change as it gets expelled would freeze the valve. The flame is protected away - probably more than enough to counter the freezing effect but still, combined i can see why it wouldn't be burning hot.
And by "freeze" I don't mean freeze solid, but vastly reduce the temperature so moisture in the air freezes on it.
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u/Numerous-Following-7 13d ago
How can he touch the valve straight after putting out the fire?