Two important indicators of the valve are the nominal diameter and the nominal pressure. The nominal diameter: “DN+ number” is used to indicate the valve diameter, but it is not the measured value of the valve diameter. According to the national standard, the measured value is greater than or equal to 95% of the nominal diameter.

The general valve is metric, the American standard valve is British; the nominal pressure: the “PN + number” is used to indicate the pressure, the nominal pressure is not equal to the actual measured value of the valve, it is the maximum working pressure allowed by the valve at the reference temperature, This value should be “closed”.

1 High Pressure Ball Valve

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