scope:

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 F_L;

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 x_TP;

f) valve style modifier F_d;

g) Reynolds number factor F_R.