The development of a new series of API safety relief valves is only possible following extensive investigation into fluid flows. This paper describes how a new method of "Flowforce -Characteristic - Measurement" facilitated extensive review of the quality of the shape of all parts in the flowing area and enabled parts to be optimised. Further, a world-class test facility enabled verification of the required characteristics for a larger range of pressures and sizes than needed for an ASME certification. In addition to these measurements, special flow calculations provided information about local fluid dynamics. Components in the flow area could therefore be optimised with high accuracy. This has resulted in a new series of API safety relief valves with ASME and TÜV certification, providing significant advantages for end users.

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