1 Add a regulating valve at the outlet of the pump, and adjust the opening of the valve to adjust the outlet pressure of the pump.

2 lead a thin tube from the outlet of the pump to the inlet of the pump, add a regulating valve on the tube, and adjust the outlet pressure of the pump through the regulating valve.

Frequency conversion control, through the frequency converter to adjust the pump speed, to achieve the adjustment of pump outlet pressure.

4. Install a hydraulic coupler between the motor and the pump, and adjust the rotating speed of the pump by adjusting the hydraulic coupler, so as to adjust the outlet pressure of the pump.