Just a general point: The system schematics and diagrams made available to pilots are simplified.
Pilots don’t need to see or know about every hydraulic joint, every sub-bus bar, or every bracket and pulley. We need to have an overall understanding of what the system does, how it works, and what the consequences are if a part fails.
So a hydraulic “bypass valve” might be shown as an in-line valve, or have no alternate fluid return, but its function should be clear enough for our purpose of flying the plane
A case in point is the two electrical diagrams of the 737 Stab trim circuits posted on one of the MCAS threads.