DN": Diametre nominel - Nominal diameter of the valve, and "50" is the size of the valve in [mm]. Alternative is NPS (Nominal pipe size in inches).
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10"size and 25bar pressure
Mean(50, 7190) = (50 + 7190)/2 = 7240/2 = 3620
50 hundreds is 50/100 or 1/2.If you mean hundredths or 5000 if in fact you mean 50 x 100
queen
it is a size