3-6
3
CONTROL VALVE
FUNCTION
CONTROL VALVE
When the spools are in the neutral position:
When the control valve spools are not moved, the oil flows
through the center bypass passage (1) and the tank pas-
sage T to r
eturn to the tank, as shown by the arrow.
When the spool is operated:
When the spool is moved to the right:
When
the spool (2) is moved to the right, the center bypass
passage (1) is closed and the oil that has flowed into the
valve from the pump passes through the parallel passage
(4), the load check valve (5), the port A, and to the actua-
tor
.
On the other hand, oil returning from the port B returns to
the tank through the tank passage T.
Load check valve
While the spool switching operation is being performed,
this valve prevents oil from flowing backward due to the
load pressure C coming from the actuator port.
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