Calculation of the relief flow rate of the safety valve when the HGT20570 control valve fails

2019-05-06View Original

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I would like to ask: In section 7.0.5.2 of HGT20570, regarding the formula for calculating the discharge capacity of the safety valve in the event of a control valve failure (for the gas phase), Cv1 represents the Cv value of the control valve. Is this Cv value the rated value of the control valve, or rather its Cv value at maximum flow? My personal understanding is that it refers to the rated value; what do others think?

Reply #22019-05-20

Additionally, which standard does formula 20570 refer to?

Reply #32020-01-19

CV is the flow rate when it’s fully open

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Calculation of the relief flow rate of the safety valve when the HGT20570 control valve fails

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