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IEC 60534-2-3 3rd Edition, December 1, 2015
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Industrial-process control valves – Part 2-3: Flow capacity – Test procedures
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This part of IEC 60534 is applicable to industrial-process control valves and provides the flow capacity test procedures for determining the following variables used in the equations given in IEC 60534-2-1:

a) flow coefficient C;

b) liquid pressure recovery factor without attached fittings FL;

c) combined liquid pressure recovery factor and piping geometry factor of a control valve with attached fittings FLP;

d) piping geometry factor FP;

e) pressure differential ratio factors xT and xTP;

f) valve style modifier Fd;

g) Reynolds number factor FR.