A Scientific connotation In this case, the valve authority (ß) is 4 PSI/16 PSI = 0.25. Referring to Figure 23, it can be seen that the valve performance characteristic is distorted and when matched to a cooling coil will not provide a linear relationship between valve position and coil output. This can lead to poor coil performance and low delta T syndrome. The solution is to try and keep the valve authority above 0.5. In other words, the pressure drop though the control valve when it is fully open should be at least 50% of the pressure drop from the supply to return line.
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A Scientific connotationIn this case, the valve authority (ß) is 4 PSI/16 PSI = 0.25. Referring to Figure 23, it can be seen that the valve performance characteristic is distorted and when matched to a cooling coil will not provide a linear relationship between valve position and coil output. This can lead to poor coil performance and low delta T syndrome. The solution is to try and keep the valve authority above 0.5. In other words, the pressure drop though the control valve when it is fully open should be at least 50% of the pressure drop from the supply to return line.
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