For those of you familiar with the Piper Arrow gear system, I am looking for a good explanation as to how the Low pressure control, high pressure control, and bleed air hole function. I always thought of them as check valves, but if the hydraulic fluid is returning to the reservoir via the LP and HP at 600 PSI and 2400 PSI respectively wouldn't that be an insane amount of pressure going back to the reservoir? Looking for some clarification on this. Thanks