Conversion between pound rating and pressure class
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I have a gentle question: 1 pound is approximately equal to 0.45 kilograms； And 1 kilogram is equal to 0.1 Mpa ； 150 pounds is approximately equal to 6.8 Mpa. So, in the conversion between pounds and nominal pressure, why does 150 pounds correspond to a pressure of 2.0 Mpa rather than 6.8 Mpa? Is this related to temperature or some other factors? Is it perhaps a difference in the conversion units? Thank you to all the experts for helping to answer this question
150Lb, 300Lb…… refer to the \"pressure rating\". In the pressure rating systems used in the UK and the US, a correspondence needs to be established with the systems used in Germany or other European countries; that’s why 150Lb is roughly equivalent to 2.0MPa. There is no one-to-one correspondence with specific pressure values
They are two separate systems; there is no corresponding conversion relationship between them – only a rough correspondence between the two systems to facilitate selection.
Actually, I sometimes wonder about this too: what exactly is the pressure that the valve can withstand, in terms of bargs.