Anyone could help suggest potential reasons?

After we installed a new monitor, which does the job of monitoring pressure, alarm and auto-shut-down when it is overpressured, the water pump cannot go any higher than 120Mpa. As we turn the pressure control valve, water pressure varies accordingly but stops climbing up around 120. As suggested by a technician from Dardi, we cleaned the control valve but it did not help.

I am new here and I have no clue what I can check or fix. Anyone could help?

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