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Pressure relief valve Engineering handbook error?

Hi there,

I was looking at the Pressure Relief Valve Engineering handbook for Anderson Greenwood, Crosby and Varec products, Technical publication No. TP-V300.

On pages 153 and 209 the coefficient C is calculated for both US and metric units respectively.

Even though the calculated values for C are correct on each plot, there is an error on the equation as printed on the page.

The error is in the equation where the k outside the square root should be inside the square root. It is the same error for both figures 7-30 and 8-30.

See equation 8 in ISO 4126-7

Many thanks


1 Reply

  • Hi Gerard
    Thank you for your comment.
    Yes; you are correct, k does belong under the radical. This was a misprint in our current catalog and will be corrected in the next revision.
    Adam Attig, Product Manager PRV