Procon style pumps are positive displacement rotary vane pumps. This means that there is a definitive amount of fluid with each revolution achieving the rated GPM. This pump curve changes very little with pressure up to the rated maximum. I run a pro con 240 that is rated at 250 PSI. The difference when u increase PSI is the work that the motor has to do under load, not the GPM as that should be similar along the entire curve. With a lower pressure, you should be working your motor less and increasing the workload as you get closer to that 250 PSI max rating. Anyone else feel free to correct me if I did not state any of that correctly.
Belle Hollow Syrup
Canaseraga, NY
375 Taps
Smoky Lake Hybrid 2x4
100 GPH RO
Oil barrel Arch