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The nominal size of the valve

The GB/T 1047-2005 standard stipulates that the valve's nominal diameter is only an indicator, represented by the combination of the symbol “DN” and the number. The nominal size cannot represent the measured valve caliber, and the valve’s actual caliber is related to the relevant standards. Regulations, the general measured value (in mm) shall not be less than 95% of the nominal size value. The nominal dimensions are metric (symbol: DN) and imperial (symbol: NPS), the national standard valve is metric, and the American standard valve is English. The metric DN values are as follows:

The preferred DN values are as follows:
The
DN 6 DN 100 DN 700 DN 2200

DN 8 DN 125 DN 800 DN 2400

DN 10 DN 150 DN 900 DN 2600

DN 15 DN 200 DN 1000 DN 2800

DN 20 DN 250 DN 1100 DN 3000

DN 25 DN 300 DN 1200 DN 3200

DN 32 DN 350 DN 1400 DN 3400

DN 40 DN 400 DN 1500 DN 3600

DN 50 DN 450 DN 1600 DN 3800

DN 65 DN 500 DN 1800 DN 4000

DN 80 DN 600 DN 2000

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