a representative open-center, sliding spool
When the spool is moved to the right of the
directional control valve.
neutral position, view B, one working line (C1)
is aligned to system pressure and the other
When this type of valve is in the neutral
working line (C2) is open through the hollow
position (fig. 6-35, view A), fluid flows into the
spool to the return port. View C shows the flow
valve through the pressure port (P) through the
of fluid through the valve with the spool moved
hollow spool, and return to the reservoir.
to the left of neutral.