I just installed a Delavan FB2 as a washdown pump. Rated for 7 GPM open flow, 5.5 gpm at 40 PSI. Pressure switch is set at 60 out of the box, but can be turned up as far as 100 safely. It's surprisingly quiet, but it does draw a lot of power (rated draw is 22.5 amps at 60 psi down to 12.3 at open flow and up to 27.1 amps at 100 psi). The motor
is large and there's no specific duty cycle given, as it'll be limited by motor cooling
. The notes on their website indicate that it can probably be run continuously at 30 - 40 psi.
If you don't need much pressure, there are likely better choices.