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- 1. A Scientific connotation In this case, the valve authority () is 4 PSI/16 PSI = 0.25. Referring to Figure 23, it can be seen that the valve performance characteristic is distorted and
- 2. 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
- 3. open should be at least 50% of the pressure drop from the supply to return line.