Control Valve – What You Need to Learn
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چکیده
ii) The control valve Manufacturer can only state the Inherent valve characteristics, which refer to the flowrate (F) – valve travel position (m or Z) relationship, when the pressure drop across the control valve (DPV) is constant. Note that the pressure drop across the control valve (DPV) can be almost constant only if the piping system pressure drop (DPS) is concentrated at the control valve and not distributed along the pipeline. This means that the pipeline must be of very short length with minimum pressure-reducing-devices or equipment in series with the control valve. Such a condition rarely exist in actual installation except in the control valve Manufacturer test facilities, where the control valve characteristics are obtained using very short length of piping. Such ideal valve characteristics are the valve Inherent characteristics.
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