NO FLUID pump, since the Romans moved water with a goat bladder has a pump built pressure! PERIOD. No fixed or variable displacement gear, vane, axial or radial piston EVER was designed or built to BUILD PRESSURE. Whether you're pumping peanut butter, hydraulic fluid, a mixture of chicken blood/fat, or water to a jet at 40,000 PSI. I've done them all and not one "built pressure".
PUMPS move fluid, period. They have various capability to move this fluid against different conditions and amounts of RESISTANCE, that we read as pressure on a pressure gauge. PRESSURE is a measure of RESISTANCE to PUMP FLOW, NOTHING ELSE.
When we read pump specs., say 10 GPM at 2500 PSI, the manufacturer is saying that the pump will MOVE 10GPM of a certain viscosity and temp fluid at a known speed against a resistance of measured 2500psi.
In my 30 years, the biggest hurdle in troubleshooting comes from somebody injecting " pump won't build pressure" into the conversation. They might wear out, and fail to move fluid, but that pump didn't "build pressure" when it was brand new. Sorry, guess this was a rant!
Edited by Toolpartzman, October 07, 2012 - 06:19 AM.