I'm trying to build a hydraulic power unit with a 5 horsepower electric motor, gear pump and tank. The flow requirement for the system is 1.7 gallons per minute. The pressure requirement is 3000 psi. I'm having some trouble finding gear pumps that are rated for high pressure and low speed. Typically they're at about 20 gallons per minute and some are around 2gpm.
I'm wondering if I get a gear pump that's capable of 2 gallons per minute and run it at a lower speed, will it still be capable of the same pressure that it's rated at at 2 gallons per minute?
Does this have diminishing returns with even lower speeds? For example if I get a pump rated at 4 gallons per minute and run it at less than half the rated speed, will it deliver the same pressure that it's rated for?