IEC 60534-2-3:2015 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.
This third edition cancels and replaces the second edition published in 1997, of which it constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) Addition of informative Annexes B, C, D, E and F.
b) Organizational and formatting changes were made to group technically related subject matter.