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Good morning to all, can somebody teach me how to adjust the pressure limits on a MQ3-45, its on 60psi I need to reduce it, it is possible?

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The pump will always increase the pressure 65 psi above the inlet pressure, so if your inlet pressure is 30 psi, the outlet will reach 95 psi. This pump doesn't turn off due to pressure, it turns off when the flow through the pump stops. To make your pump turn off at a lower pressure, install a pressure switch ($20) somewhere in your system. Call the Grundfos tech rep and he will most likely agree this is an acceptable fix.

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