Larry Jaques fired this volley in
:

Yes, parallel. (Current throne room material is a '67 Sperry Rand
Vickers Mobile Hydraulics Manual)

Fooey! The two spools already on there aren't in parallel! With open-
center spools, the 'bypass' (drain, if you will) of one valve feeds the
next valve's pressure input.

If you put open-center valves in parallel, nothing moves unless ALL the
valves are actuated, and then they all move.

The valves are "physically in parallel", because they're constructed to
dump flow to the next valve, and/or accept flow from the prior one.

But schematically, they're in series.


Lloyd