1 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:
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a) flow coefficient C;
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b) liquid pressure recovery factor without attached fittings FL;
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c) combined liquid pressure recovery factor and piping geometry factor of a control valve with attached fittings FLP;
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d) piping geometry factor FP;
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e) pressure differential ratio factors xT and xTP;
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f) valve style modifier Fd;
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g) Reynolds number factor FR.