The flow control valve at the discharge of the hp pump is provided for the following reasons to kill the pressure to suit the required pressure.Its becauseas u rate the pump for the 3rd yr and 20deg c membrane operation, the normal operation at the first yr requires lesser head.the head can be reduced by vfd applying suitable affinity losses. thereis a limit upto which your head and hence the remaining pressure is killed.Most of the times HP pumps are not controlled by VFD due to the high cost of VFD (often Medium Voltage is required) so the only means to control the discharge pressure is the plug valve.
Pressure required by the system changes along the time with temperature, salinity and membrane age, so the control valve is necessary to keep a certain production.

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