(1) Operation of
Plunger
(a) Neutral
Oil discharged from
the
main
pump
flows through the neutral
passage
back to the oil
tank.
CYLINDER
PORT
*Q
:J
LOAD
CHECK VALVE
PARALLEL FEEDER
CYLINDER
PORT
RETURN
SPRING
¢A»'
NEUTRAL
PASSAGE
/
PLUNGER
i" LOW-PRESSURE PASSAGE
s
6
Fig,
11-2
(b) Pushing
in
of Plunger
The neutral
passages
are closed
and
the oil flows through parallel
feeder, pushing
up
the load check
valve,
into the cylinder port "B"-
The returning oil
from
the cylinder
port
"A"
flows through the
low-
pressure
passage
to the
tank.
The
plunger
is
restored to the
neutral
position
by
the return spring.
(c)
Drawing
out of Plunger
With
the
neutral
passage
closed,
the oil pushes
up
the load check
valve,
passing through the parallel
feeder,
and
flows into the cylinder
port
"A".
The returning oil
from
the cylinder port "B" flows
through
the low-pressure
passage
to
the tank. The plunger is restored to
the neutral position by the return
spring.
\
N
I
Fig.
11-3
I
O O\\
s
¢
Fig.
11-4
82
To Next Page