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The nominal size of the valve

 

 According to GB/T 1047-2005 standard, the nominal size of the valve is just a mark which was made up by symbol "DN'' and digital. Nominal size can't represent the observed data of the valve size values. The actual diameter valve was regulated by the value of each standard related. Generally measured (unit mm) shall not be less than 95% of the nominal size values. Nominal size points the metric system (the symbol: DN) and the British system (the symbol: NPS), national standard valve use the metric system, American standard valve was for the British system.

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