I also think I need to try to clarify something.... Correction if needed is appreciated.
So, tractor running, no hydraulic requirement. Pump pushes fluid thru the FEL valves, thru the 3rd function valves (if equipped), thru the rear remotes, thru the 3pt and dumps back to the tank. No pressure established. Open flow. This cycle can go on indefinitely and create minimal heat because there is virtually very little resistance.
When a valve is activated, regardless of where it is in this chain, it first closes the "open" path. Then it diverts this flow to whatever function is desired. Let's say lifting the FEL. Suddenly the relaxed open flow of fluid has been disrupted. Now we begin to build pressure. Whatever pressure required to lift the FEL is exerted. No bypass is required. Suddenly we reach the end of the FEL lift cylinder's stroke. Now the PB in the FEL valve is activated. All excess pressure is pushed down the line. If no other action is required, it quietly dumps into the tank. Let's say we have also activated the 3rd function. Now the pump provides pressure to the FEL lift, it bypasses down the line thru the PB because the lift cylinder has reached it's max stroke, now the 3rd function has the pump's full ouput. Action will be quickly completed. Now the PB in the 3rd function valve is activated. All excess pressure is pushed down the line. If no other action is required, it quietly dumps into the tank. This process continues as long as a valve is activated. When us operators are done required pressure the whole system goes back to the relaxed state and fluid is simply dumped back into the tank. If this makes no sense or if I'm in error please let me know. I think it's beneficial for everyone to understand how this works.