2-58
From stopping to starting (high speed)
Motor
M1
M2
Oil passage "A"
Distriction "C"
Distriction "B"
Oil passage "B"
Oil passage "C"
Spool
Inlet
(High pressure)
Outlet
(Low pressure)
(High pressure)
(Low pressure)
Counter balance valve spool
R35Z72TM13
(1)
Counterbalance valve spool is moved to right position by the force of spring when port P1 is
pressurized. According as the movement of spool, P1 connects to M1 and M2 connects to P2.
Consequently the motor work. At the same time, oil passage A is selected high pressure,
however, there is no oil flow to oil passage C because of the movement of spool.