Figure 34: Flow rate versus delta pressure (water control valve fully open)
A minimum water pressure difference of 1.0 to 1.5 bar (15 to 20 psi) between facility supply and return is required. Figure 34 gives the pressure difference with a fully opened control valve. In operation the control valve is maintaining the water flow to the MCS 5042 by introducing pressure resistance to reduce the flow to accommodate different water temperatures and cooling capacity. This way the pressure loss in operation appears higher than shown in Figure 34. But to have the full scale of water flow available, the provided system pressure difference must be slightly higher than the maximum pressure loss with a fully opened control valve.
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